| retardent | (noun) any agent that retards or delays or hinders | Synonyms: retardant, retardation |
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| reticent | (adjective) temperamentally disinclined to talk | Synonyms: untalkative |
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| (adjective) reluctant to draw attention to yourself | Synonyms: retiring, self-effacing |
| (adjective) cool and formal in manner | Synonyms: restrained, unemotional |
| retirement | (noun) withdrawal from your position or occupation | - |
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| (noun) withdrawal for prayer and study and meditation | Synonyms: retreat |
| (noun) the state of being retired from one's business or occupation | - |
| retrenchment | (noun) the reduction of expenditures in order to become financially stable | Synonyms: curtailment, downsizing |
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| (noun) entrenchment consisting of an additional interior fortification to prolong the defense | - |
| reverent | (adjective) feeling or showing profound respect or veneration | - |
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| (adjective) showing great reverence for god | Synonyms: godly, worshipful |
| revetement | (noun) a facing (usually masonry) that supports an embankment | Synonyms: revetment, stone facing |
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| revetment | (noun) a facing (usually masonry) that supports an embankment | Synonyms: revetement, stone facing |
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| (noun) a barrier against explosives | - |
| revilement | (noun) a rude expression intended to offend or hurt | Synonyms: abuse, contumely, insult, vilification |
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| rodent | (noun) relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing | Synonyms: gnawer |
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| rubefacient | (noun) a medicine for external application that produces redness of the skin | - |
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| rudiment | (noun) the remains of a body part that was functional at an earlier stage of life | - |
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| sacrament | (noun) a formal religious ceremony conferring a specific grace on those who receive it; the two Protestant ceremonies are baptism and the Lord's Supper; in the Roman Catholic Church and the Eastern Orthodox Church there are seven traditional rites accepted as instituted by Jesus: baptism and confirmation and Holy Eucharist and penance and holy orders and matrimony and extreme unction | - |
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| salient | (adjective) (of angles) pointing outward at an angle of less than 180 degrees | - |
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| (adjective) having a quality that thrusts itself into attention | Synonyms: outstanding, prominent, spectacular, striking |
| (adjective) represented as leaping (rampant but leaning forward) | - |
| (noun) (military) the part of the line of battle that projects closest to the enemy | - |
| sapient | (adjective) acutely insightful and wise | Synonyms: perspicacious, sagacious |
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| scandent | (adjective) used especially of plants; having a tendency to climb | - |
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| scent | (noun) any property detected by the olfactory system | Synonyms: aroma, odor, odour, olfactory property, smell |
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| (noun) an odor left in passing by which a person or animal can be traced | - |
| (noun) a distinctive odor that is pleasant | Synonyms: aroma, fragrance, perfume |
| (verb) apply perfume to | Synonyms: perfume |
| (verb) catch the scent of; get wind of | Synonyms: nose, wind |
| (verb) cause to smell or be smelly | Synonyms: odorize, odourise |
| secernment | (noun) the cognitive process whereby two or more stimuli are distinguished | Synonyms: discrimination |
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| (noun) the organic process of synthesizing and releasing some substance | Synonyms: secretion |
| secondment | (noun) the detachment of a person from their regular organization for temporary assignment elsewhere | - |
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| (noun) a speech seconding a motion | Synonyms: endorsement, indorsement, second |
| sediment | (noun) matter that has been deposited by some natural process | Synonyms: deposit |
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| (verb) settle as sediment | - |
| (verb) deposit as a sediment | - |
| segment | (noun) one of several parts or pieces that fit with others to constitute a whole object | Synonyms: section |
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| (noun) one of the parts into which something naturally divides | - |
| (verb) divide into segments | Synonyms: section |
| (verb) divide or split up | - |
| semipermanent | (adjective) relating to or extending over a relatively long time | Synonyms: long-run, long-term |
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| semitransparent | (adjective) allowing light to pass through diffusely | Synonyms: translucent |
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| senescent | (adjective) growing old | Synonyms: ageing, aging |
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| sent | (adjective) caused or enabled to go or be conveyed or transmitted | - |
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| (noun) 100 senti equal 1 kroon in Estonia | - |
| sentient | (adjective) endowed with feeling and unstructured consciousness | Synonyms: animate |
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| (adjective) consciously perceiving | - |
| sentiment | (noun) a personal belief or judgment that is not founded on proof or certainty | Synonyms: opinion, persuasion, thought, view |
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| (noun) tender, romantic, or nostalgic feeling or emotion | - |
| sequent | (adjective) in regular succession without gaps | Synonyms: consecutive, sequential, serial, successive |
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| (adjective) occurring with or following as a consequence | Synonyms: accompanying, attendant, collateral, concomitant, consequent, ensuant, incidental, resultant |
| serpent | (noun) limbless scaly elongate reptile; some are venomous | Synonyms: ophidian, snake |
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| (noun) an obsolete bass cornet; resembles a snake | - |
| (noun) a firework that moves in serpentine manner when ignited | - |
| settlement | (noun) termination of a business operation by using its assets to discharge its liabilities | Synonyms: liquidation |
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| (noun) the act of colonizing; the establishment of colonies | Synonyms: colonisation, colonization |
| (noun) something settled or resolved; the outcome of decision making | Synonyms: closure, resolution |
| (noun) a conclusive resolution of a matter and disposition of it | - |
| (noun) a body of people who settle far from home but maintain ties with their homeland; inhabitants remain nationals of their home state but are not literally under the home state's system of government | Synonyms: colony |
| (noun) a community of people smaller than a town | Synonyms: small town, village |
| (noun) an area where a group of families live together | - |
| shipment | (noun) the act of sending off something | Synonyms: despatch, dispatch |
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| (noun) goods carried by a large vehicle | Synonyms: cargo, consignment, freight, lading, load, loading, payload |
| silent | (adjective) implied by or inferred from actions or statements | Synonyms: tacit, understood |
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| (adjective) unable to speak because of hereditary deafness | Synonyms: dumb, mute |
| (adjective) having a frequency below or above the range of human audibility | - |
| (adjective) marked by absence of sound | Synonyms: soundless, still |
| (adjective) failing to speak or communicate etc when expected to | Synonyms: mum |
| (adjective) not made to sound | Synonyms: unsounded |
| (adjective) expressed without speech | Synonyms: mute, tongueless, unspoken, wordless |
| solacement | (noun) the comfort you feel when consoled in times of disappointment | Synonyms: consolation, solace |
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| (noun) comfort in disappointment or misery | Synonyms: solace |
| solvent | (adjective) capable of meeting financial obligations | - |
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| (noun) a statement that solves a problem or explains how to solve the problem | Synonyms: answer, resolution, result, solution |
| (noun) a liquid substance capable of dissolving other substances | Synonyms: dissolvent, dissolver, dissolving agent, resolvent |
| somnolent | (adjective) inclined to or marked by drowsiness | Synonyms: slumberous, slumbery, slumbrous |
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| sorbefacient | (adjective) inducing or promoting absorption | Synonyms: absorbefacient |
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| sorbent | (noun) a material that sorbs another substance; i.e. that has the capacity or tendency to take it up by either absorption or adsorption | Synonyms: sorbent material |
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| spent | (adjective) depleted of energy, force, or strength | Synonyms: exhausted |
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| (adjective) drained of energy or effectiveness; extremely tired; completely exhausted | Synonyms: dog-tired, exhausted, fagged, fatigued, gone, played out, washed-out, worn-out, worn out |
| statement | (noun) a message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc | - |
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| (noun) a document showing credits and debits | Synonyms: financial statement |
| (noun) a fact or assertion offered as evidence that something is true | Synonyms: argument |
| (noun) (computer science) a line of code written as part of a computer program | Synonyms: command, instruction, program line |
| (noun) (music) the presentation of a musical theme | - |
| (noun) a nonverbal message | - |
| (noun) the act of affirming or asserting or stating something | Synonyms: affirmation, assertion |
| stent | (noun) a slender tube inserted inside a tubular body part (as a blood vessel) to provide support during and after surgical anastomosis | - |
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| stepparent | (noun) the spouse of your parent by a subsequent marriage | - |
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| strident | (adjective) unpleasantly loud and harsh | Synonyms: raucous |
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| (adjective) being sharply insistent on being heard | Synonyms: shrill |
| (adjective) conspicuously and offensively loud; given to vehement outcry | Synonyms: blatant, clamant, clamorous, vociferous |
| (adjective) of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then') | Synonyms: continuant, fricative, sibilant, spirant |
| stringent | (adjective) demanding strict attention to rules and procedures | Synonyms: rigorous, tight |
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| student | (noun) a learner who is enrolled in an educational institution | Synonyms: educatee, pupil |
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| (noun) someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs | Synonyms: assimilator, learner, scholar |
| subcontinent | (noun) a large and distinctive landmass (as India or Greenland) that is a distinct part of some continent | - |
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| subjacent | (adjective) lying nearby but lower | - |
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| subsequent | (adjective) following in time or order | - |
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| subservient | (adjective) serving or acting as a means or aid | Synonyms: implemental, instrumental |
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| (adjective) abjectly submissive; characteristic of a slave or servant | Synonyms: slavish, submissive |
| (adjective) compliant and obedient to authority | - |
| subvent | (verb) guarantee financial support of | Synonyms: subvention, underwrite |
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| succulent | (adjective) tender and full of juice | Synonyms: lush |
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| (noun) a plant adapted to arid conditions and characterized by fleshy water-storing tissues that act as water reservoirs | - |
| sufficient | (adjective) of a quantity that can fulfill a need or requirement but without being abundant | - |
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| suffrutescent | (adjective) of a plant; having a woody base that does not die down each year | - |
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| superincumbent | (adjective) lying or resting on and exerting pressure on something else | - |
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| superintendent | (noun) a person who directs and manages an organization | Synonyms: overseer |
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| (noun) a caretaker for an apartment house; represents the owner as janitor and rent collector | Synonyms: super |
| superjacent | (adjective) lying immediately above or on something else | - |
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| supplement | (noun) a supplementary component that improves capability | Synonyms: accessory, add-on, appurtenance |
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| (noun) a quantity added (e.g. to make up for a deficiency) | Synonyms: supplementation |
| (noun) textual matter that is added onto a publication; usually at the end | Synonyms: addendum, postscript |
| (verb) add to the very end | Synonyms: add on, affix, append |
| (verb) add as a supplement to what seems insufficient | - |
| (verb) serve as a supplement to | - |
| sustainment | (noun) the act of sustaining life by food or providing a means of subsistence | Synonyms: maintenance, sustenance, sustentation, upkeep |
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| talent | (noun) natural abilities or qualities | Synonyms: endowment, gift, natural endowment |
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| (noun) a person who possesses unusual innate ability in some field or activity | - |
| tangent | (noun) ratio of the opposite to the adjacent side of a right-angled triangle | Synonyms: tan |
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| (noun) a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point | - |
| tapotement | (noun) massage in which the body is tapped rhythmically with the fingers or with short rapid movements of the sides of the hand; used to loosen mucus on the chest walls of patients with bronchitis | - |
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| tegument | (noun) a natural protective body covering and site of the sense of touch | Synonyms: cutis, skin |
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| temperament | (noun) an adjustment of the intervals (as in tuning a keyboard instrument) so that the scale can be used to play in different keys | - |
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| (noun) your usual mood | Synonyms: disposition |
| (noun) excessive emotionalism or irritability and excitability (especially when displayed openly) | - |
| tenement | (noun) a run-down apartment house barely meeting minimal standards | Synonyms: tenement house |
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| tent | (noun) a portable shelter (usually of canvas stretched over supporting poles and fastened to the ground with ropes and pegs) | Synonyms: collapsible shelter |
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| (noun) a web that resembles a tent or carpet | - |
| (verb) live in or as if in a tent | Synonyms: bivouac, camp, camp out, encamp |
| testament | (noun) a profession of belief | - |
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| (noun) a legal document declaring a person's wishes regarding the disposal of their property when they die | Synonyms: will |
| (noun) strong evidence for something | - |
| tetravalent | (adjective) having a valence of four | - |
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| torment | (noun) the act of harassing someone | Synonyms: badgering, bedevilment, worrying |
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| (noun) a severe affliction | Synonyms: curse |
| (noun) intense feelings of suffering; acute mental or physical pain | Synonyms: agony, torture |
| (noun) extreme mental distress | Synonyms: anguish, torture |
| (noun) a feeling of intense annoyance caused by being tormented | Synonyms: harassment |
| (noun) unbearable physical pain | Synonyms: torture |
| (verb) subject to torture | Synonyms: excruciate, torture |
| (verb) torment emotionally or mentally | Synonyms: excruciate, rack, torture |
| (verb) treat cruelly | Synonyms: bedevil, crucify, dun, frustrate, rag |
| torrent | (noun) a violently fast stream of water (or other liquid) | Synonyms: violent stream |
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| (noun) a heavy rain | Synonyms: cloudburst, deluge, downpour, pelter, soaker, waterspout |
| (noun) an overwhelming number or amount | Synonyms: deluge, flood, inundation |
| totipotent | (adjective) having the ability to give rise to unlike cells | - |
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| tournament | (noun) a sporting competition in which contestants play a series of games to decide the winner | Synonyms: tourney |
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| (noun) a series of jousts between knights contesting for a prize | - |
| traducement | (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions | Synonyms: calumniation, calumny, defamation, hatchet job, obloquy |
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| transcendent | (adjective) exceeding or surpassing usual limits especially in excellence | Synonyms: surpassing |
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| (adjective) beyond and outside the ordinary range of human experience or understanding | - |
| transient | (adjective) of a mental act; causing effects outside the mind | Synonyms: transeunt |
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| (adjective) lasting a very short time | Synonyms: ephemeral, fugacious, passing, short-lived, transitory |
| (noun) (physics) a short-lived oscillation in a system caused by a sudden change of voltage or current or load | - |
| (noun) one who stays for only a short time | - |
| translucent | (adjective) allowing light to pass through diffusely | Synonyms: semitransparent |
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| transparent | (adjective) transmitting light; able to be seen through with clarity | Synonyms: crystal clear, crystalline, limpid, lucid, pellucid |
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| (adjective) easily understood or seen through (because of a lack of subtlety) | - |
| (adjective) free of deceit | Synonyms: guileless |
| (adjective) so thin as to transmit light | Synonyms: cobwebby, diaphanous, filmy, gauze-like, gauzy, gossamer, see-through, sheer, vaporous, vapourous |
| transshipment | (noun) the transfer from one conveyance to another for shipment | - |
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| treatment | (noun) care provided to improve a situation (especially medical procedures or applications that are intended to relieve illness or injury) | Synonyms: intervention |
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| (noun) the management of someone or something | Synonyms: handling |
| (noun) (medicine) the act of caring for someone (as by medication or remedial training etc.) | Synonyms: therapy |
| (noun) a manner of dealing with something artistically | - |
| (noun) an extended communication (often interactive) dealing with some particular topic | Synonyms: discourse, discussion |
| trident | (noun) a spear with three prongs | - |
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| trivalent | (adjective) having a valence of three | - |
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| truculent | (adjective) defiantly aggressive | - |
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| tumescent | (adjective) abnormally distended especially by fluids or gas | Synonyms: bloated, distended, intumescent, puffy, swollen, tumid, turgid |
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| turbulent | (adjective) (of a liquid) agitated vigorously; in a state of turbulence | Synonyms: churning, roiled, roiling, roily |
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| (adjective) characterized by unrest or disorder or insubordination | Synonyms: disruptive, riotous, troubled, tumultuous |
| unapparent | (adjective) not readily apparent | - |
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| unbent | (adjective) erect in posture | Synonyms: straight, unbowed |
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| (adjective) not bent | - |
| underachievement | (noun) poorer than expected performance (poorer than might have been predicted from intelligence tests) | - |
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| undercurrent | (noun) a subdued emotional quality underlying an utterance; implicit meaning | Synonyms: undertone |
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| (noun) a current below the surface of a fluid | Synonyms: undertide |
| underdevelopment | (noun) (photography) inadequate processing of film resulting in inadequate contrast | - |
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| (noun) state of inadequate development | - |
| undergarment | (noun) a garment worn under other garments | Synonyms: unmentionable |
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| underlayment | (noun) a pad placed under a carpet | Synonyms: carpet pad, rug pad, underlay |
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| undernourishment | (noun) not having enough food to develop or function normally | Synonyms: malnourishment |
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| underpayment | (noun) the act of paying less than required | - |
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| (noun) a payment smaller than needed or expected | - |
| understatement | (noun) a statement that is restrained in ironic contrast to what might have been said | - |
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| unemployment | (noun) the state of being unemployed or not having a job | - |
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| unenlightenment | (noun) a lack of understanding | - |
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| unguent | (noun) semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation | Synonyms: balm, ointment, salve, unction |
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| unintelligent | (adjective) lacking intelligence | Synonyms: stupid |
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| univalent | (adjective) used of a chromosome that is not paired or united with its homologous chromosome during synapsis | - |
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| (adjective) having a valence of 1 | Synonyms: monovalent |
| unsent | (adjective) not dispatched or transmitted | - |
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| unspent | (adjective) (of financial resources) not spent | Synonyms: unexpended |
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| urgent | (adjective) compelling immediate action | Synonyms: pressing |
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| valent | (adjective) (chemistry) having valence; usually used in combination | - |
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