| 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 | - |
| inexact | (adjective) not exact | - |
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| intact | (adjective) (used of domestic animals) sexually competent | Synonyms: entire |
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| (adjective) undamaged in any way | - |
| (adjective) (of a woman) having the hymen unbroken | Synonyms: inviolate |
| (adjective) constituting the undiminished entirety; lacking nothing essential especially not damaged | Synonyms: entire, integral |
| 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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| intractable | (adjective) not tractable; difficult to manage or mold | - |
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| lactating | (adjective) producing or secreting milk | Synonyms: wet |
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| lacteal | (adjective) relating to or consisting of or producing or resembling milk | - |
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| lactic | (adjective) of or relating to or obtained from milk (especially sour milk or whey) | - |
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| lactogenic | (adjective) inducing lactation | - |
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| manufactured | (adjective) produced in a large-scale industrial operation | - |
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| multifactorial | (adjective) involving or depending on several factors or causes (especially pertaining to a condition or disease resulting from the interaction of many genes) | - |
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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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| nonretractable | (adjective) not capable of being retracted | Synonyms: nonretractile |
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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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| olfactory | (adjective) of or relating to olfaction | Synonyms: olfactive |
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| overactive | (adjective) more active than normal | Synonyms: hyperactive |
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| polydactyl | (adjective) of or relating to a person (or other vertebrate) having more than the normal number of digits | Synonyms: polydactylous |
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| polydactylous | (adjective) of or relating to a person (or other vertebrate) having more than the normal number of digits | Synonyms: polydactyl |
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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 |
| protracted | (adjective) relatively long in duration; tediously protracted | Synonyms: drawn-out, extended, lengthy, prolonged |
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| 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 |
| refractory | (adjective) stubbornly resistant to authority or control | Synonyms: fractious, recalcitrant |
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| (adjective) temporarily unresponsive or not fully responsive to a process or stimulus | - |
| (adjective) not responding to treatment | Synonyms: stubborn |
| retractable | (adjective) capable of being retracted | - |
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| retracted | (adjective) drawn back and in | - |
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| 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 |
| satisfactory | (adjective) giving satisfaction | - |
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| (adjective) meeting requirements | Synonyms: acceptable, decent |
| semiabstract | (adjective) characterized by stylized but recognizable subject matter | - |
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| 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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| tactful | (adjective) having or showing a sense of what is fitting and considerate in dealing with others | - |
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| (adjective) showing skill and sensitivity in dealing with people | Synonyms: kid-glove |
| 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 |
| tactless | (adjective) lacking or showing a lack of what is fitting and considerate in dealing with others | Synonyms: untactful |
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| (adjective) revealing lack of perceptiveness or judgment or finesse | Synonyms: inept |
| tactual | (adjective) of or relating to or proceeding from the sense of touch | Synonyms: haptic, tactile |
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| (adjective) producing a sensation of touch | Synonyms: tactile |
| tractable | (adjective) easily managed (controlled or taught or molded) | Synonyms: manipulable |
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| (adjective) responsive to suggestions and influences | Synonyms: amenable |
| 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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| unactable | (adjective) not actable | - |
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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 |
| uncharacteristic | (adjective) distinctive and not typical | - |
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| 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 | - |
| unsatisfactory | (adjective) not giving satisfaction | - |
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| untactful | (adjective) lacking or showing a lack of what is fitting and considerate in dealing with others | Synonyms: tactless |
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| zygodactyl | (adjective) (of bird feet) having the first and fourth toes directed backward the second and third forward | - |
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