| abactinal | (adjective) (of radiate animals) located on the surface or end opposite to that on which the mouth is situated | - |
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| abstractionist | (adjective) not representing or imitating external reality or the objects of nature | Synonyms: abstract, nonfigurative, nonobjective |
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| abstractive | (adjective) of an abstracting nature or having the power of abstracting | - |
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| actinal | (adjective) (of radiate organisms) located on the surface or end on which the mouth is situated | - |
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| acting | (adjective) serving temporarily especially as a substitute | - |
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| actinic | (adjective) relating to or exhibiting actinism | - |
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| actinoid | (adjective) having a radial form | - |
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| actinometric | (adjective) of or related to actinometry | Synonyms: actinometrical |
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| actinometrical | (adjective) of or related to actinometry | Synonyms: actinometric |
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| actinomorphic | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphous |
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| actinomorphous | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphic |
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| actinomycetal | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetous |
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| actinomycetous | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetal |
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| actinomycotic | (adjective) of or related to actinomycosis infection | - |
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| actionable | (adjective) affording grounds for legal action | - |
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| activated | (adjective) rendered active; e.g. rendered radioactive or luminescent or photosensitive or conductive | - |
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| (adjective) (military) set up and placed on active assignment | - |
| (adjective) (of e.g. a molecule) made reactive or more reactive | Synonyms: excited |
| (adjective) (of sewage) treated with aeration and bacteria to aid decomposition | - |
| activating | (adjective) causing motion or action or change | Synonyms: actuating |
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| active | (adjective) (used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')) expressing action rather than a state of being | Synonyms: dynamic |
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| (adjective) characterized by energetic activity | - |
| (adjective) tending to become more severe or wider in scope | - |
| (adjective) disposed to take action or effectuate change | - |
| (adjective) (of e.g. volcanoes) erupting or liable to erupt | - |
| (adjective) (of e.g. volcanoes) capable of erupting | - |
| (adjective) full of activity or engaged in continuous activity | - |
| (adjective) exerting influence or producing a change or effect | - |
| (adjective) engaged in full-time work | - |
| (adjective) expressing that the subject of the sentence has the semantic function of actor: | - |
| (adjective) (of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions | - |
| (adjective) in operation | Synonyms: alive |
| (adjective) taking part in an activity | Synonyms: participating |
| (adjective) engaged in or ready for military or naval operations | Synonyms: combat-ready, fighting |
| activist | (adjective) advocating or engaged in activism | Synonyms: activistic |
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| activistic | (adjective) advocating or engaged in activism | Synonyms: activist |
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| anaphylactic | (adjective) related to the hypersensitivity known as anaphylaxis | - |
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| anticlimactic | (adjective) coming after the climax especially of a dramatic or narrative plot | - |
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| (adjective) of or relating to a sudden change from an impressive to a ludicrous style | Synonyms: anticlimactical |
| anticlimactical | (adjective) of or relating to a sudden change from an impressive to a ludicrous style | Synonyms: anticlimactic |
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| apractic | (adjective) having uncoordinated muscular movements, symptomatic of a CNS disorder | Synonyms: apraxic |
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| atactic | (adjective) lacking motor coordination; marked or caused by ataxia | Synonyms: ataxic |
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| ataractic | (adjective) tending to soothe or tranquilize | Synonyms: ataraxic, sedative, tranquilising, tranquilizing, tranquillising, tranquillizing |
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| attractive | (adjective) pleasing to the eye or mind especially through beauty or charm | - |
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| (adjective) having the properties of a magnet; the ability to draw or pull | - |
| (adjective) having power to arouse interest | - |
| autodidactic | (adjective) relating to or having the characteristics of an autodidact | - |
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| calefactive | (adjective) serving to heat | Synonyms: calefactory |
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| chylifactive | (adjective) producing or converting into chyle | Synonyms: chylifactory, chylific |
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| climactic | (adjective) consisting of or causing a climax | - |
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| contractile | (adjective) capable of contracting or being contracted | - |
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| counteractive | (adjective) opposing or neutralizing or mitigating an effect by contrary action | - |
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| detractive | (adjective) causing to decrease in importance or value | - |
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| didactic | (adjective) instructive (especially excessively) | Synonyms: didactical |
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| didactical | (adjective) instructive (especially excessively) | Synonyms: didactic |
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| exacting | (adjective) having complicated nutritional requirements; especially growing only in special artificial cultures | Synonyms: fastidious |
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| (adjective) requiring precise accuracy | Synonyms: exigent |
| (adjective) severe and unremitting in making demands | Synonyms: stern, strict |
| extractible | (adjective) capable of being extracted | Synonyms: extractable |
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| extragalactic | (adjective) outside or beyond a galaxy | - |
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| factious | (adjective) dissenting (especially dissenting with the majority opinion) | Synonyms: dissentious, divisive |
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| factitious | (adjective) not produced by natural forces | - |
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| fractional | (adjective) constituting or comprising a part or fraction of a possible whole or entirety | Synonyms: partial |
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| (adjective) constituting a division or an aliquot part of the basic monetary unit | Synonyms: divisional |
| fractious | (adjective) unpredictably difficult in operation; likely to be troublesome | - |
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| (adjective) stubbornly resistant to authority or control | Synonyms: recalcitrant, refractory |
| (adjective) easily irritated or annoyed | Synonyms: cranky, irritable, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
| galactic | (adjective) of or relating to a galaxy (especially our galaxy the Milky Way) | - |
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| (adjective) inconceivably large | Synonyms: astronomic, astronomical |
| hyperactive | (adjective) more active than normal | Synonyms: overactive |
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| hypoactive | (adjective) abnormally inactive | Synonyms: underactive |
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| impracticable | (adjective) not capable of being carried out or put into practice | Synonyms: infeasible, unfeasible, unworkable |
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| impractical | (adjective) not practical; not workable or not given to practical matters | - |
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| (adjective) not practical or realizable; speculative | Synonyms: airy, Laputan, visionary, windy |
| inactive | (adjective) (military) not involved in military operations | Synonyms: nonoperational |
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| (adjective) not active physically or mentally | - |
| (adjective) (pathology) not progressing or increasing; or progressing slowly | - |
| (adjective) lacking activity; lying idle or unused | - |
| (adjective) lacking in energy or will | Synonyms: passive |
| (adjective) (of e.g. volcanoes) not erupting and not extinct | Synonyms: dormant |
| (adjective) not exerting influence or change | - |
| (adjective) not engaged in full-time work | - |
| (adjective) not in physical motion | Synonyms: motionless, static, still |
| (adjective) (chemistry) not participating in a chemical reaction; chemically inert | - |
| interactional | (adjective) capable of acting on or influencing each other | Synonyms: interactive |
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| interactive | (adjective) used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more) | Synonyms: synergistic |
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| (adjective) capable of acting on or influencing each other | Synonyms: interactional |
| intergalactic | (adjective) between or among galaxies | - |
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| lactic | (adjective) of or relating to or obtained from milk (especially sour milk or whey) | - |
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| nonprotractile | (adjective) not extensile | Synonyms: inextensible, nonextensile |
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| nonpsychoactive | (adjective) not affecting the mind or mental processes | - |
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| nonradioactive | (adjective) not radioactive | - |
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| nonretractile | (adjective) not capable of being retracted | Synonyms: nonretractable |
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| olfactive | (adjective) of or relating to olfaction | Synonyms: olfactory |
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| overactive | (adjective) more active than normal | Synonyms: hyperactive |
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| practicable | (adjective) capable of being done with means at hand and circumstances as they are | Synonyms: executable, feasible, viable, workable |
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| (adjective) usable for a specific purpose | Synonyms: operable |
| practical | (adjective) concerned with actual use or practice | - |
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| (adjective) having or put to a practical purpose or use | - |
| (adjective) guided by practical experience and observation rather than theory | Synonyms: hard-nosed, hardheaded, pragmatic |
| (adjective) being actually such in almost every respect | Synonyms: virtual |
| practiced | (adjective) skillful after much practice | Synonyms: practised |
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| (adjective) having or showing knowledge and skill and aptitude | Synonyms: adept, expert, good, proficient, skilful, skillful |
| practised | (adjective) skillful after much practice | Synonyms: practiced |
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| proactive | (adjective) descriptive of any event or stimulus or process that has an effect on events or stimuli or processes that occur subsequently | - |
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| (adjective) (of a policy or person or action) controlling a situation by causing something to happen rather than waiting to respond to it after it happens | - |
| prophylactic | (adjective) preventing or contributing to the prevention of disease | Synonyms: preventative, preventive |
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| (adjective) warding off | Synonyms: cautionary |
| (adjective) capable of preventing conception or impregnation | Synonyms: antifertility, contraceptive |
| protractible | (adjective) able to be extended | Synonyms: protractile |
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| protractile | (adjective) able to be extended | Synonyms: protractible |
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| psychoactive | (adjective) affecting the mind or mood or other mental processes | Synonyms: psychotropic |
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| putrefactive | (adjective) causing or promoting bacterial putrefaction | Synonyms: putrefacient |
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| radioactive | (adjective) exhibiting or caused by radioactivity | - |
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| reactionary | (adjective) opposed to political or social liberalism or reform | Synonyms: far-right, reactionist |
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| reactionist | (adjective) opposed to political or social liberalism or reform | Synonyms: far-right, reactionary |
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| reactive | (adjective) participating readily in reactions | - |
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| (adjective) reacting to a stimulus | Synonyms: responsive |
| refractile | (adjective) of or relating to or capable of refraction | Synonyms: refractive |
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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 |
| retractile | (adjective) capable of retraction; capable of being drawn back | - |
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| 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 |
| subtractive | (adjective) constituting or involving subtraction | - |
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| syntactic | (adjective) of or relating to or conforming to the rules of syntax | Synonyms: syntactical |
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| syntactical | (adjective) of or relating to or conforming to the rules of syntax | Synonyms: syntactic |
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| tactical | (adjective) of or pertaining to tactic or tactics | - |
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| tactile | (adjective) of or relating to or proceeding from the sense of touch | Synonyms: haptic, tactual |
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| (adjective) producing a sensation of touch | Synonyms: tactual |
| tractile | (adjective) capable of being shaped or bent or drawn out | Synonyms: ductile, malleable, pliable, pliant, tensile |
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| tractive | (adjective) exerting traction and serving to pull | - |
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| transactinide | (adjective) of or belonging to the elements with atomic numbers greater than 103 | - |
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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 |
| underactive | (adjective) abnormally inactive | Synonyms: hypoactive |
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| unexacting | (adjective) not rigorous | - |
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| unpracticed | (adjective) not having had extensive practice | Synonyms: unpractised, unversed |
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| unpractised | (adjective) not having had extensive practice | Synonyms: unpracticed, unversed |
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| unreactive | (adjective) (chemistry) not reacting chemically | - |
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| (adjective) not tending to react to stimulation | - |