| qualitative | (adjective) involving distinctions based on qualities | - |
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| (adjective) relating to or involving comparisons based on qualities | - |
| quantitative | (adjective) expressible as a quantity or relating to or susceptible of measurement | - |
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| (adjective) (of verse) having a metric system based on relative duration of syllables | - |
| (adjective) relating to the measurement of quantity | - |
| radioactive | (adjective) exhibiting or caused by radioactivity | - |
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| radiosensitive | (adjective) sensitive to radiation | - |
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| ratiocinative | (adjective) based on exact thinking | - |
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| reactive | (adjective) participating readily in reactions | - |
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| (adjective) reacting to a stimulus | Synonyms: responsive |
| rebarbative | (adjective) serving or tending to repel | Synonyms: repellant, repellent |
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| receptive | (adjective) ready or willing to receive favorably | Synonyms: open |
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| (adjective) able to absorb liquid (not repellent) | - |
| (adjective) of a nerve fiber or impulse originating outside and passing toward the central nervous system | Synonyms: centripetal, sensory |
| (adjective) open to arguments, ideas, or change | - |
| reciprocative | (adjective) moving alternately backward and forward | Synonyms: reciprocatory |
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| (adjective) given or done or owed to each other | Synonyms: reciprocatory |
| recitative | (noun) a vocal passage of narrative text that a singer delivers with natural rhythms of speech | - |
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| recollective | (adjective) good at remembering | Synonyms: long, retentive, tenacious |
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| reconstructive | (adjective) helping to restore to good condition | Synonyms: rehabilitative |
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| recriminative | (adjective) countering one charge with another | Synonyms: recriminatory |
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| recuperative | (adjective) promoting recuperation | Synonyms: restorative |
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| redemptive | (adjective) of or relating to or resulting in redemption | Synonyms: redemptional, redemptory |
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| (adjective) bringing about salvation or redemption from sin | Synonyms: redeeming, saving |
| reductive | (adjective) characterized by or causing diminution or curtailment | - |
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| reflective | (adjective) capable of physically reflecting light or sound | - |
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| (adjective) devoted to matters of the mind | - |
| (adjective) deeply or seriously thoughtful | Synonyms: brooding, broody, contemplative, meditative, musing, pensive, pondering, ruminative |
| reformative | (adjective) tending to reform | Synonyms: reformatory |
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| refractive | (adjective) of or relating to or capable of refraction | Synonyms: refractile |
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| (adjective) capable of changing the direction (of a light or sound wave) | Synonyms: deflective |
| regulative | (adjective) restricting according to rules or principles | Synonyms: regulatory |
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| rehabilitative | (adjective) designed to accomplish rehabilitation | - |
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| (adjective) helping to restore to good condition | Synonyms: reconstructive |
| reiterative | (adjective) marked by iteration | Synonyms: iterative |
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| rejective | (adjective) rejecting or tending to reject | - |
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| relative | (adjective) estimated by comparison; not absolute or complete | Synonyms: comparative |
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| (adjective) properly related in size or degree or other measurable characteristics; usually followed by `to' | Synonyms: proportional |
| (noun) an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus) | Synonyms: congenator, congener, congeneric |
| (noun) a person related by blood or marriage | Synonyms: relation |
| remunerative | (adjective) for which money is paid | Synonyms: compensable, paying, salaried, stipendiary |
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| (adjective) producing a sizeable profit | Synonyms: lucrative, moneymaking |
| renunciative | (adjective) used especially of behavior | Synonyms: renunciant, self-abnegating, self-denying |
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| repetitive | (adjective) characterized by repetition | Synonyms: repetitious |
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| (adjective) repetitive and persistent | Synonyms: insistent |
| representative | (adjective) standing for something else | - |
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| (adjective) being or characteristic of government by representation in which citizens exercise power through elected officers and representatives | - |
| (adjective) serving to represent or typify | - |
| (noun) an item of information that is typical of a class or group | Synonyms: example, illustration, instance |
| (noun) a person who represents others | - |
| (noun) a member of the United States House of Representatives | - |
| (noun) an advocate who represents someone else's policy or purpose | Synonyms: interpreter, spokesperson, voice |
| reproductive | (adjective) producing new life or offspring | Synonyms: generative, procreative |
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| repudiative | (adjective) rejecting emphatically; e.g. refusing to pay or disowning | - |
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| resistive | (adjective) exhibiting or relating to electrical resistance | - |
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| (adjective) disposed to or engaged in defiance of established authority | Synonyms: insubordinate, resistant |
| respective | (adjective) considered individually | Synonyms: several, various |
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| restive | (adjective) impatient especially under restriction or delay | - |
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| (adjective) being in a tense state | Synonyms: edgy, high-strung, highly strung, jittery, jumpy, nervy, overstrung, uptight |
| restorative | (adjective) promoting recuperation | Synonyms: recuperative |
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| (adjective) tending to impart new life and vigor to | Synonyms: renewing, revitalising, revitalizing, reviving |
| (noun) a device for treating injury or disease | Synonyms: corrective |
| (noun) a medicine that strengthens and invigorates | Synonyms: tonic |
| restrictive | (adjective) serving to restrict | - |
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| (adjective) (of tariff) protective of national interests by restricting imports | - |
| retaliative | (adjective) of or relating to or having the nature of retribution | Synonyms: retaliatory, retributive, retributory, vindicatory |
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| retentive | (adjective) good at remembering | Synonyms: long, recollective, tenacious |
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| (adjective) having the capacity to retain something | - |
| (adjective) having the power, capacity, or quality of retaining water | - |
| retributive | (adjective) given or inflicted in requital according to merits or deserts | Synonyms: retributory, vindicatory |
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| (adjective) of or relating to or having the nature of retribution | Synonyms: retaliative, retaliatory, retributory, vindicatory |
| retroactive | (adjective) descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously | - |
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| (adjective) affecting things past | Synonyms: ex post facto, retro |
| retrospective | (adjective) concerned with or related to the past | - |
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| (noun) an exhibition of a representative selection of an artist's life work | - |
| reverberative | (adjective) characterized by resonance | Synonyms: resonant, resonating, resounding, reverberating |
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| 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 | - |
| 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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| 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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| 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 |
| 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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| suffocative | (adjective) causing difficulty in breathing especially through lack of fresh air and presence of heat | Synonyms: choking, smothering, suffocating |
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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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| suppurative | (adjective) relating to or characterized by suppuration | - |
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| 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 |
| 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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| 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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| unappreciative | (adjective) not feeling or expressing gratitude | - |
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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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| 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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| unexplorative | (adjective) not exploratory | Synonyms: nonexplorative, nonexploratory, unexploratory |
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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 |
| 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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| uninventive | (adjective) deficient in originality or creativity; lacking powers of invention | Synonyms: sterile, unimaginative, uninspired |
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| unmedicative | (adjective) not having a medicinal effect or not medically prescribed | Synonyms: nonmedicinal, unmedical, unmedicinal |
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