| semiopaque | (adjective) partially opaque | - |
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| semiotic | (adjective) of or relating to semiotics | Synonyms: semiotical |
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| semiotical | (adjective) of or relating to semiotics | Synonyms: semiotic |
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| semiparasitic | (adjective) of or relating to plants that are semiparasites | - |
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| semipermanent | (adjective) relating to or extending over a relatively long time | Synonyms: long-run, long-term |
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| semipermeable | (adjective) (of a membrane) selectively permeable | - |
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| semipolitical | (adjective) political in some (but not all) aspects | - |
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| semiprecious | (adjective) used of gemstones having less commercial value than precious stones | - |
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| semiprivate | (adjective) confined to a small number of hospital patients | - |
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| semipublic | (adjective) having some of the features of public institution | - |
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| semirigid | (adjective) not fully rigid | - |
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| (adjective) having a form maintained by a rigid internal structure as well as by internal gas pressure | - |
| semiskilled | (adjective) possessing or requiring limited skills | - |
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| semisoft | (adjective) somewhat soft | Synonyms: softish |
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| semisolid | (adjective) partly solid; having a rigidity and viscosity intermediate between a solid and a liquid | - |
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| semisweet | (adjective) having a taste that is a mixture of bitterness and sweetness | Synonyms: bittersweet |
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| semisynthetic | (adjective) not of natural origin; prepared or made artificially | Synonyms: man-made, synthetic |
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| semiterrestrial | (adjective) chiefly but not exclusively terrestrial | - |
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| semitransparent | (adjective) allowing light to pass through diffusely | Synonyms: translucent |
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| semitropic | (adjective) of or relating to or characteristic of conditions in the subtropics | Synonyms: semitropical, subtropic, subtropical |
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| semitropical | (adjective) of or relating to or characteristic of conditions in the subtropics | Synonyms: semitropic, subtropic, subtropical |
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| semiweekly | (adjective) occurring twice a week | Synonyms: biweekly |
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| sempiternal | (adjective) having no known beginning and presumably no end | Synonyms: dateless, endless |
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| senatorial | (adjective) of or relating to senators | - |
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| senescent | (adjective) growing old | Synonyms: ageing, aging |
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| senile | (adjective) mentally or physically infirm with age | Synonyms: doddering, doddery, gaga |
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| senior | (adjective) older; higher in rank; longer in length of tenure or service | - |
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| (adjective) used of the fourth and final year in United States high school or college | Synonyms: fourth-year |
| (adjective) advanced in years; (`aged' is pronounced as two syllables) | Synonyms: aged, elderly, older |
| sensate | (adjective) having physical sensation | - |
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| sensational | (adjective) causing intense interest, curiosity, or emotion | - |
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| (adjective) relating to or concerned in sensation | Synonyms: sensory |
| (adjective) commanding attention | Synonyms: arresting, stunning |
| sensationalistic | (adjective) typical of tabloids | Synonyms: scandalmongering, yellow |
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| sensed | (adjective) detected by instinct or inference rather than by recognized perceptual cues | Synonyms: perceived |
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| senseless | (adjective) (of especially persons) lacking sense or understanding or judgment | Synonyms: nitwitted, soft-witted, witless |
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| (adjective) unresponsive to stimulation | Synonyms: insensible, out of it |
| (adjective) not marked by the use of reason | Synonyms: mindless, reasonless |
| (adjective) serving no useful purpose; having no excuse for being | Synonyms: otiose, pointless, purposeless, superfluous, wasted |
| sensible | (adjective) able to feel or perceive | Synonyms: sensitive |
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| (adjective) showing reason or sound judgment | Synonyms: reasonable |
| (adjective) aware intuitively or intellectually of something sensed | - |
| (adjective) readily perceived by the senses | - |
| sensitised | (adjective) having an allergy or peculiar or excessive susceptibility (especially to a specific factor) | Synonyms: allergic, hypersensitised, hypersensitive, hypersensitized, sensitized, supersensitised, supersensitive, supersensitized |
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| sensitising | (adjective) making susceptible or sensitive to either physical or emotional stimuli | Synonyms: sensitizing |
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| sensitive | (adjective) responsive to physical stimuli | - |
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| (adjective) being susceptible to the attitudes, feelings, or circumstances of others | - |
| (adjective) able to feel or perceive | Synonyms: sensible |
| (adjective) of or pertaining to classified information or matters affecting national security | - |
| (adjective) hurting | Synonyms: raw, sore, tender |
| sensitized | (adjective) having an allergy or peculiar or excessive susceptibility (especially to a specific factor) | Synonyms: allergic, hypersensitised, hypersensitive, hypersensitized, sensitised, supersensitised, supersensitive, supersensitized |
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| sensitizing | (adjective) making susceptible or sensitive to either physical or emotional stimuli | Synonyms: sensitising |
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| sensorial | (adjective) involving or derived from the senses | Synonyms: sensory |
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| sensorimotor | (adjective) of or relating to the sensory and motor coordination of an organism or to the controlling nerves | - |
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| sensorineural | (adjective) of or relating to the neural process of sensation | - |
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| sensory | (adjective) involving or derived from the senses | Synonyms: sensorial |
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| (adjective) relating to or concerned in sensation | Synonyms: sensational |
| (adjective) of a nerve fiber or impulse originating outside and passing toward the central nervous system | Synonyms: centripetal, receptive |
| sensual | (adjective) sexually exciting or gratifying | Synonyms: sultry |
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| (adjective) marked by the appetites and passions of the body | Synonyms: animal, carnal, fleshly |
| sensuous | (adjective) taking delight in beauty | - |
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| sent | (adjective) caused or enabled to go or be conveyed or transmitted | - |
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| sentential | (adjective) of or relating to a sentence | - |
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| sententious | (adjective) concise and full of meaning | Synonyms: pithy |
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| (adjective) abounding in or given to pompous or aphoristic moralizing | - |
| sentient | (adjective) endowed with feeling and unstructured consciousness | Synonyms: animate |
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| (adjective) consciously perceiving | - |
| sentimental | (adjective) effusively or insincerely emotional | Synonyms: bathetic, drippy, hokey, kitschy, maudlin, mawkish, mushy, sappy, schmaltzy, schmalzy, slushy, soppy, soupy |
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| (adjective) given to or marked by sentiment or sentimentality | - |
| sepaline | (adjective) resembling or characteristic of a sepal | Synonyms: sepaloid |
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| sepaloid | (adjective) resembling or characteristic of a sepal | Synonyms: sepaline |
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| separable | (adjective) capable of being divided or dissociated | Synonyms: dissociable, severable |
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| separate | (adjective) independent; not united or joint | - |
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| (adjective) standing apart; not attached to or supported by anything | Synonyms: freestanding |
| (adjective) separated according to race, sex, class, or religion | - |
| (adjective) have the connection undone; having become separate | Synonyms: disjoined |
| separated | (adjective) spaced apart | Synonyms: spaced |
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| (adjective) separated at the joint | Synonyms: disjointed, dislocated |
| (adjective) being or feeling set or kept apart from others | Synonyms: detached, isolated, set-apart |
| (adjective) no longer connected or joined | Synonyms: detached |
| separatist | (adjective) having separated or advocating separation from another entity or policy or attitude | Synonyms: breakaway, fissiparous |
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| separative | (adjective) (of a word) referring singly and without exception to the members of a group | - |
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| (adjective) serving to separate or divide into parts | Synonyms: partitive |
| (adjective) (used of an accent in Hebrew orthography) indicating that the word marked is separated to a greater or lesser degree rhythmically and grammatically from the word that follows it | - |
| septal | (adjective) of or relating to a septum | Synonyms: septate |
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| septate | (adjective) of or relating to a septum | Synonyms: septal |
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| septic | (adjective) containing or resulting from disease-causing organisms | Synonyms: infected |
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| (adjective) of or relating to or caused by putrefaction | - |
| septicemic | (adjective) characteristic of septicemia | - |
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| septrional | (adjective) of northern regions; from the seven stars (or seven plowing oxen) of Ursa Major | - |
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| septuple | (adjective) having seven units or components | Synonyms: seven-fold, sevenfold |
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| sepulchral | (adjective) of or relating to a sepulchre | - |
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| (adjective) suited to or suggestive of a grave or burial | Synonyms: funereal |
| (adjective) gruesomely indicative of death or the dead | Synonyms: charnel, ghastly |
| 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 |
| sequential | (adjective) in regular succession without gaps | Synonyms: consecutive, sequent, serial, successive |
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| sequestered | (adjective) providing privacy or seclusion | Synonyms: cloistered, reclusive, secluded |
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| (adjective) kept separate and secluded | - |
| sequined | (adjective) covered with beads or jewels or sequins | Synonyms: beady, gemmed, jeweled, jewelled, spangled, spangly |
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| seraphic | (adjective) of or relating to an angel of the first order | Synonyms: seraphical |
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| (adjective) having a sweet nature befitting an angel or cherub | Synonyms: angelic, angelical, cherubic, sweet |
| seraphical | (adjective) of or relating to an angel of the first order | Synonyms: seraphic |
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| sere | (adjective) (used especially of vegetation) having lost all moisture | Synonyms: dried-up, sear, shriveled, shrivelled, withered |
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| serendipitous | (adjective) lucky in making unexpected and fortunate discoveries | - |
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| serene | (adjective) completely clear and fine | - |
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| (adjective) not agitated; without losing self-possession | Synonyms: calm, tranquil, unagitated |
| serflike | (adjective) like someone in servitude | - |
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| serial | (adjective) pertaining to or occurring in or producing a series | - |
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| (adjective) pertaining to or composed in serial technique | - |
| (adjective) of or relating to the sequential performance of multiple operations | Synonyms: in series, nonparallel |
| (adjective) in regular succession without gaps | Synonyms: consecutive, sequent, sequential, successive |
| sericeous | (adjective) covered with fine soft hairs or down | Synonyms: downy, puberulent, pubescent |
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| sericultural | (adjective) of or relating to sericulture | - |
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| seriocomic | (adjective) mixing the serious with the comic with comic predominating | Synonyms: seriocomical |
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| seriocomical | (adjective) mixing the serious with the comic with comic predominating | Synonyms: seriocomic |
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| serious | (adjective) concerned with work or important matters rather than play or trivialities | - |
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| (adjective) completely lacking in playfulness | Synonyms: sober, unplayful |
| (adjective) causing fear or anxiety by threatening great harm | Synonyms: dangerous, grave, grievous, life-threatening, severe |
| (adjective) requiring effort or concentration; complex and not easy to answer or solve | - |
| (adjective) of great consequence | - |
| (adjective) appealing to the mind | Synonyms: good |
| serologic | (adjective) of or relating to serology | Synonyms: serological |
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| serological | (adjective) of or relating to serology | Synonyms: serologic |
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| serous | (adjective) of or producing or containing serum | - |
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| serpentine | (adjective) resembling a serpent in form | Synonyms: snakelike, snaky |
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| serrate | (adjective) notched like a saw with teeth pointing toward the apex | Synonyms: notched, saw-toothed, serrated, toothed |
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| serrated | (adjective) notched like a saw with teeth pointing toward the apex | Synonyms: notched, saw-toothed, serrate, toothed |
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| serried | (adjective) (especially of rows as of troops or mountains) pressed together | - |
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| serrulate | (adjective) minutely serrated | - |
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| serviceable | (adjective) ready for service or able to give long service | - |
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| (adjective) intended or able to serve a purpose without elaboration | - |
| (adjective) capable of being put to good use | - |
| servile | (adjective) submissive or fawning in attitude or behavior | - |
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| (adjective) relating to or involving slaves or appropriate for slaves or servants | - |
| servo | (adjective) of or involving servomechanisms | Synonyms: servomechanical |
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| servomechanical | (adjective) of or involving servomechanisms | Synonyms: servo |
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| sesquipedalian | (adjective) (of words) long and ponderous; having many syllables | Synonyms: polysyllabic |
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| (adjective) given to the overuse of long words | - |
| sessile | (adjective) attached directly by the base; not having an intervening stalk | Synonyms: stalkless |
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| (adjective) permanently attached to a substrate; not free to move about | - |
| set | (adjective) set down according to a plan | Synonyms: laid |
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| (adjective) being below the horizon | - |
| (adjective) converted to solid form (as concrete) | Synonyms: hardened |
| (adjective) fixed and unmoving | Synonyms: fixed, rigid |
| (adjective) (usually followed by `to' or `for') on the point of or strongly disposed | Synonyms: fit, primed |
| (adjective) situated in a particular spot or position | Synonyms: located, placed, situated |
| (adjective) determined or decided upon as by an authority | Synonyms: determined, dictated |
| setaceous | (adjective) having or covered with protective barbs or quills or spines or thorns or setae etc. | Synonyms: barbed, barbellate, briary, briery, bristled, bristly, burred, burry, prickly, setose, spiny, thorny |
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| setose | (adjective) having or covered with protective barbs or quills or spines or thorns or setae etc. | Synonyms: barbed, barbellate, briary, briery, bristled, bristly, burred, burry, prickly, setaceous, spiny, thorny |
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| settled | (adjective) established in a desired position or place; not moving about | - |
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| (adjective) established or decided beyond dispute or doubt | - |
| (adjective) not changeable | - |
| (adjective) inhabited by colonists | Synonyms: colonised, colonized |
| seven | (adjective) being one more than six | Synonyms: 7, vii |
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| sevenfold | (adjective) having seven units or components | Synonyms: septuple, seven-fold |
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| seventeen | (adjective) being one more than sixteen | Synonyms: 17, xvii |
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| seventeenth | (adjective) coming next after the sixteenth in position | Synonyms: 17th |
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