| ruminative | (adjective) deeply or seriously thoughtful | Synonyms: brooding, broody, contemplative, meditative, musing, pensive, pondering, reflective |
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| sanative | (adjective) tending to cure or restore to health | Synonyms: alterative, curative, healing, remedial, therapeutic |
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| sanctionative | (adjective) implying sanction or serving to sanction | Synonyms: sanctioning |
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| secretive | (adjective) inclined to secrecy or reticence about divulging information | Synonyms: close, closelipped, closemouthed, tightlipped |
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| sedative | (adjective) tending to soothe or tranquilize | Synonyms: ataractic, ataraxic, tranquilising, tranquilizing, tranquillising, tranquillizing |
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| (noun) a drug that reduces excitability and calms a person | Synonyms: depressant, downer, sedative drug |
| seductive | (adjective) tending to entice into a desired action or state | - |
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| selective | (adjective) tending to select; characterized by careful choice | - |
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| (adjective) characterized by very careful or fastidious selection | - |
| semiconductive | (adjective) having characteristics of a semiconductor; that is having electrical conductivity greater than insulators but less than good conductors | Synonyms: semiconducting |
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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 |
| (noun) someone who serves as an intermediary between the living and the dead | Synonyms: medium, spiritualist |
| 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 | - |
| shrive | (verb) grant remission of a sin to | Synonyms: absolve |
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| siccative | (noun) a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture) | Synonyms: desiccant, drier, drying agent |
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| significative | (adjective) (usually followed by `of') pointing out or revealing clearly | Synonyms: indicative, indicatory, revelatory, suggestive |
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| skive | (verb) remove the surface of | - |
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| skydive | (verb) jump from an airplane and perform various maneuvers before opening one's parachute | Synonyms: sky dive |
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| speculative | (adjective) showing curiosity | Synonyms: inquisitive, questioning, wondering |
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| (adjective) not based on fact or investigation | Synonyms: notional |
| (adjective) not financially safe or secure | Synonyms: bad, high-risk, risky |
| sportive | (adjective) relating to or interested in sports | - |
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| (adjective) given to merry frolicking | Synonyms: coltish, frolicky, frolicsome, rollicking |
| stative | (adjective) (used of verbs (e.g. `be' or `own') and most participial adjectives) expressing existence or a state rather than an action | - |
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| sternutative | (adjective) causing sneezing | Synonyms: sternutatory |
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| stimulative | (adjective) capable of arousing or accelerating physiological or psychological activity or response by a chemical agent | - |
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| strive | (verb) to exert much effort or energy | Synonyms: reach, strain |
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| (verb) attempt by employing effort | Synonyms: endeavor, endeavour |
| subjective | (adjective) taking place within the mind and modified by individual bias | - |
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| (adjective) of a mental act performed entirely within the mind | Synonyms: immanent |
| subjunctive | (adjective) relating to a mood of verbs | - |
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| (noun) a mood that represents an act or state (not as a fact but) as contingent or possible | Synonyms: subjunctive mood |
| submissive | (adjective) inclined or willing to submit to orders or wishes of others or showing such inclination | - |
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| (adjective) abjectly submissive; characteristic of a slave or servant | Synonyms: slavish, subservient |
| subordinative | (adjective) serving to connect a subordinate clause to a main clause | Synonyms: subordinating |
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| substantiative | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, corroboratory, substantiating, validating, validatory, verificatory, verifying |
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| substantive | (adjective) defining rights and duties as opposed to giving the rules by which rights and duties are established | Synonyms: essential |
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| (adjective) of or relating to the real nature or essential elements of something | Synonyms: substantial |
| (adjective) being on topic and prompting thought | Synonyms: meaty |
| (noun) any word or group of words functioning as a noun | - |
| subtractive | (adjective) constituting or involving subtraction | - |
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| subversive | (adjective) in opposition to a civil authority or government | Synonyms: insurgent, seditious |
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| (noun) a radical supporter of political or social revolution | Synonyms: revolutionary, revolutionist, subverter |
| successive | (adjective) in regular succession without gaps | Synonyms: consecutive, sequent, sequential, serial |
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| suffocative | (adjective) causing difficulty in breathing especially through lack of fresh air and presence of heat | Synonyms: choking, smothering, suffocating |
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| suffusive | (adjective) spreading through | - |
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| suggestive | (adjective) tending to suggest or imply | Synonyms: implicative |
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| (adjective) tending to suggest something improper or indecent | - |
| (adjective) (usually followed by `of') pointing out or revealing clearly | Synonyms: indicative, indicatory, revelatory, significative |
| summative | (adjective) of or relating to a summation or produced by summation | Synonyms: summational |
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| superlative | (adjective) highest in quality | Synonyms: greatest, sterling |
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| (noun) an exaggerated expression (usually of praise) | - |
| (noun) the superlative form of an adjective or adverb | Synonyms: superlative degree |
| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: acme, elevation, height, meridian, peak, pinnacle, summit, tiptop, top |
| supersensitive | (adjective) having an allergy or peculiar or excessive susceptibility (especially to a specific factor) | Synonyms: allergic, hypersensitised, hypersensitive, hypersensitized, sensitised, sensitized, supersensitised, supersensitized |
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| supportive | (adjective) furnishing support or assistance | - |
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| suppressive | (adjective) tending to suppress | - |
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| suppurative | (adjective) relating to or characterized by suppuration | - |
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| survive | (verb) support oneself | Synonyms: exist, live, subsist |
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| (verb) continue to live and avoid dying | Synonyms: endure, go, hold out, hold up, last, live, live on |
| (verb) continue in existence after (an adversity, etc.) | Synonyms: come through, make it, pull round, pull through |
| (verb) live longer than | Synonyms: outlast, outlive |
| suspensive | (adjective) undecided or characterized by indecisiveness | - |
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| (adjective) (of a situation) characterized by or causing suspense | Synonyms: cliff-hanging, nail-biting, suspenseful |
| talkative | (adjective) friendly and open and willing to talk | Synonyms: expansive |
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| (adjective) unwisely talking too much | Synonyms: bigmouthed, blabbermouthed, blabby |
| (adjective) full of trivial conversation | Synonyms: chatty, gabby, garrulous, loquacious, talky |
| tardive | (adjective) late-occurring (especially with reference to symptoms of a disease) | - |
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| tentative | (adjective) under terms not final or fully worked out or agreed upon | Synonyms: probationary, provisional, provisionary |
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| (adjective) unsettled in mind or opinion | Synonyms: doubtful |
| terminative | (adjective) coming to an end | - |
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| thrive | (verb) grow vigorously | Synonyms: boom, expand, flourish |
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| (verb) make steady progress; be at the high point in one's career or reach a high point in historical significance or importance | Synonyms: flourish, fly high, prosper |
| tractive | (adjective) exerting traction and serving to pull | - |
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| transitive | (adjective) designating a verb that requires a direct object to complete the meaning | - |
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| (noun) a verb (or verb construction) that requires an object in order to be grammatical | Synonyms: transitive verb, transitive verb form |
| ulcerative | (adjective) of or relating to or characterized by ulceration | - |
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| ultraconservative | (adjective) extremely conservative | - |
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| (noun) an extreme conservative; an opponent of progress or liberalism | Synonyms: extreme right-winger, reactionary |
| unacquisitive | (adjective) not acquisitive; not interested in acquiring or owning anything | - |
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| unaggressive | (adjective) not aggressive; not given to fighting or assertiveness | Synonyms: nonaggressive |
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| unappreciative | (adjective) not feeling or expressing gratitude | - |
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| unapprehensive | (adjective) not recognizing or slow to recognize danger | - |
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| unargumentative | (adjective) not given to or characterized by argument | - |
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| unassertive | (adjective) inclined to timidity or lack of self-confidence | - |
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| unattractive | (adjective) lacking beauty or charm | - |
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| (adjective) lacking power to arouse interest | - |
| (adjective) not appealing to the senses | Synonyms: untempting |
| uncommunicative | (adjective) not inclined to talk or give information or express opinions | Synonyms: incommunicative |
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| uncompetitive | (adjective) not inclined to compete | - |
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| unconstructive | (adjective) not constructive | - |
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| uncooperative | (adjective) unwilling to cooperate | - |
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| (adjective) intentionally unaccommodating | Synonyms: disobliging |
| uncreative | (adjective) not creative | - |
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| undeceive | (verb) free from deception or illusion | - |
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| undemonstrative | (adjective) not given to open expression of emotion | - |
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| underactive | (adjective) abnormally inactive | Synonyms: hypoactive |
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| underivative | (adjective) not derivative or imitative | - |
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| undescriptive | (adjective) not successful in describing | - |
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| uneffective | (adjective) not producing an intended effect | Synonyms: ineffective, ineffectual |
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| unexclusive | (adjective) not restricted or exclusive | Synonyms: unrestricted |
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| unexpansive | (adjective) showing no tendency to expand | - |
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| (adjective) not given to high spirits or effusiveness | - |
| unexplorative | (adjective) not exploratory | Synonyms: nonexplorative, nonexploratory, unexploratory |
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| unexpressive | (adjective) deliberately impassive in manner | Synonyms: deadpan, expressionless, impassive, poker-faced |
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| unimaginative | (adjective) lacking spontaneity or originality or individuality | Synonyms: stereotyped, stereotypic, stereotypical |
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| (adjective) dealing only with concrete facts | - |
| (adjective) deficient in originality or creativity; lacking powers of invention | Synonyms: sterile, uninspired, uninventive |
| unimpressive | (adjective) not capable of impressing | - |
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| uninformative | (adjective) lacking information | - |
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| uninquisitive | (adjective) not inquiring | Synonyms: uninquiring |
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| (adjective) deficient in curiosity | Synonyms: uninquiring |
| uninstructive | (adjective) failing to instruct | - |
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| unintrusive | (adjective) not interfering or meddling | Synonyms: not intrusive |
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| uninventive | (adjective) deficient in originality or creativity; lacking powers of invention | Synonyms: sterile, unimaginative, uninspired |
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| unlive | (verb) live so as to annul some previous behavior | Synonyms: live down |
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| unmedicative | (adjective) not having a medicinal effect or not medically prescribed | Synonyms: nonmedicinal, unmedical, unmedicinal |
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| unobjective | (adjective) (of e.g. evidence) not objective or easily verified | Synonyms: unverifiable |
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| unobtrusive | (adjective) not obtrusive or undesirably noticeable | - |
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| unperceptive | (adjective) lacking perception | Synonyms: unperceiving |
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| (adjective) lacking sensitivity, taste, or judgment | - |
| unpermissive | (adjective) not inclined to grant permission; severe in discipline | - |
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| unpersuasive | (adjective) not capable of persuading | - |
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| unpredictive | (adjective) having no predictive value | - |
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| unproductive | (adjective) not producing or capable of producing | - |
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| (adjective) not producing desired results | - |
| unprogressive | (adjective) old-fashioned and out of date | Synonyms: fusty, nonprogressive, standpat |
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| unprotective | (adjective) not affording protection | - |
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| unprovocative | (adjective) not provocative | Synonyms: unprovoking |
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| unreactive | (adjective) (chemistry) not reacting chemically | - |
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| (adjective) not tending to react to stimulation | - |
| unreceptive | (adjective) not receptive | - |
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| unreflective | (adjective) not exhibiting or characterized by careful thought | Synonyms: unthinking, unthoughtful |
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| unremunerative | (adjective) not yielding profit or recompense | - |
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| unrepresentative | (adjective) not exemplifying a class | - |
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| unresponsive | (adjective) not responding to some influence or stimulus | - |
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| (adjective) aloof or indifferent | - |
| (adjective) not susceptible to suggestion or influence | - |
| unrestrictive | (adjective) not tending to restrict | - |
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| unretentive | (adjective) (of memory) deficient in retentiveness or range | Synonyms: forgetful, short |
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| unseductive | (adjective) not seductive | - |
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