| impossible | (adjective) not capable of occurring or being accomplished or dealt with | - |
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| (adjective) (used of persons or their behavior) not acceptable or reasonable | Synonyms: unacceptable |
| (adjective) totally unlikely | Synonyms: inconceivable, out of the question, unimaginable |
| impotent | (adjective) lacking power or ability | - |
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| (adjective) (of a male) unable to copulate | - |
| impoverished | (adjective) destroyed financially | Synonyms: broken, wiped out |
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| (adjective) poor enough to need help from others | Synonyms: destitute, indigent, necessitous, needy, poverty-stricken |
| 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 |
| imprecise | (adjective) not precise | - |
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| impregnable | (adjective) capable of conceiving | Synonyms: conceptive |
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| (adjective) immune to attack; incapable of being tampered with | Synonyms: inviolable, secure, strong, unassailable, unattackable |
| (adjective) incapable of being overcome, challenged or refuted | Synonyms: inexpugnable |
| impressed | (adjective) deeply or markedly affected or influenced | - |
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| impressible | (adjective) easily impressed or influenced | Synonyms: impressionable, waxy |
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| impressionable | (adjective) easily impressed or influenced | Synonyms: impressible, waxy |
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| impressionist | (adjective) relating to or characteristic of Impressionism | Synonyms: impressionistic |
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| impressionistic | (adjective) relating to or characteristic of Impressionism | Synonyms: impressionist |
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| (adjective) of or relating to or based on an impression rather than on facts or reasoning | - |
| impressive | (adjective) making a strong or vivid impression | - |
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| (adjective) producing a strong effect | Synonyms: telling |
| imprisoned | (adjective) being in captivity | Synonyms: captive, confined, jailed |
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| improbable | (adjective) not likely to be true or to occur or to have occurred | Synonyms: unlikely |
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| (adjective) having a probability too low to inspire belief | Synonyms: unbelievable, unconvincing, unlikely |
| (adjective) too improbable to admit of belief | Synonyms: marvellous, marvelous, tall |
| impromptu | (adjective) with little or no preparation or forethought | Synonyms: ad-lib, extemporaneous, extemporary, extempore, off-the-cuff, offhand, offhanded, unrehearsed |
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| improper | (adjective) not suitable or right or appropriate | - |
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| (adjective) not appropriate for a purpose or occasion | Synonyms: wrong |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: unconventional, unlawful |
| improvable | (adjective) susceptible of improvement | - |
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| improved | (adjective) made more desirable or valuable or profitable; especially made ready for use or marketing | - |
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| (adjective) become or made better in quality | - |
| (adjective) (of land) made ready for development or agriculture by clearing of trees and brush | - |
| improvident | (adjective) not provident; not providing for the future | - |
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| (adjective) not given careful consideration | Synonyms: ill-considered, ill-judged, shortsighted |
| improving | (adjective) getting higher or more vigorous | Synonyms: up |
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| improvised | (adjective) done or made using whatever is available | Synonyms: jury-rigged, makeshift |
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| imprudent | (adjective) not prudent or wise | - |
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| (adjective) lacking wise self-restraint | - |
| impudent | (adjective) marked by casual disrespect | Synonyms: flip, insolent, snotty-nosed |
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| (adjective) improperly forward or bold | Synonyms: fresh, impertinent, overbold, sassy, saucy, smart, wise |
| impugnable | (adjective) subject to being discredited | - |
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| impuissant | (adjective) lacking physical strength or vigor | - |
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| impulsive | (adjective) determined by chance or impulse or whim rather than by necessity or reason | Synonyms: capricious, whimsical |
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| (adjective) having the power of driving or impelling | Synonyms: driving |
| (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: brainish, hotheaded, impetuous, madcap, tearaway |
| (adjective) proceeding from natural feeling or impulse without external stimulus | Synonyms: unprompted |
| (adjective) without forethought | - |
| impure | (adjective) (used of persons or behaviors) immoral or obscene | - |
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| (adjective) combined with extraneous elements | - |
| (adjective) having a physical or moral blemish so as to make impure according to dietary or ceremonial laws | Synonyms: unclean |
| imputable | (adjective) capable of being assigned or credited to | Synonyms: ascribable, due, referable |
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| imputrescible | (adjective) not subject to decay | - |
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| incomparable | (adjective) such that comparison is impossible; unsuitable for comparison or lacking features that can be compared | Synonyms: uncomparable |
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| incompatible | (adjective) used especially of drugs or muscles that counteract or neutralize each other's effect | Synonyms: antagonistic |
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| (adjective) not compatible | - |
| (adjective) incapable of being used with or connected to other devices or components without modification | - |
| (adjective) not suitable to your tastes or needs | Synonyms: uncongenial |
| (adjective) of words so related that one contrasts with the other | Synonyms: contrastive |
| (adjective) used especially of solids or solutions; incapable of blending into a stable homogeneous mixture | - |
| (adjective) not in keeping with what is correct or proper | Synonyms: inappropriate, out of keeping, unfitting |
| (adjective) not compatible with other facts | Synonyms: discrepant |
| (adjective) not easy to combine harmoniously | Synonyms: ill-sorted, mismated, unsuited |
| incompetent | (adjective) not qualified or suited for a purpose | - |
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| (adjective) legally not qualified or sufficient | Synonyms: unqualified |
| (adjective) not doing a good job | Synonyms: unskilled |
| (adjective) not meeting requirements | Synonyms: incapable, unequal to |
| (adjective) showing lack of skill or aptitude | Synonyms: bungling, clumsy, fumbling |
| incomplete | (adjective) not complete or total; not completed | Synonyms: uncomplete |
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| (adjective) not yet finished | Synonyms: uncompleted |
| incomprehensible | (adjective) difficult to understand | Synonyms: uncomprehensible |
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| (adjective) incapable of being explained or accounted for | Synonyms: inexplicable |
| incomprehensive | (adjective) not comprehensive | Synonyms: noncomprehensive |
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| incompressible | (adjective) incapable of being compressed; resisting compression | - |
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| incomputable | (adjective) beyond calculation or measure | Synonyms: immeasurable, inestimable |
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| intemperate | (adjective) excessive in behavior | - |
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| (adjective) (of weather or climate) not mild; subject to extremes | - |
| (adjective) given to excessive indulgence of bodily appetites especially for intoxicating liquors | Synonyms: hard, heavy |
| jumpy | (adjective) causing or characterized by jolts and irregular movements | Synonyms: bumpy, jolting, jolty, rocky, rough |
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| (adjective) being in a tense state | Synonyms: edgy, high-strung, highly strung, jittery, nervy, overstrung, restive, uptight |
| kempt | (adjective) (of hair) neat and tidy | Synonyms: tidy |
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| lamplit | (adjective) lighted by a lamp | - |
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| limp | (adjective) lacking or having lost rigidity | - |
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| (adjective) without energy or will | Synonyms: wilted |
| limpid | (adjective) (of language) transparently clear; easily understandable | Synonyms: crystal clear, lucid, luculent, pellucid, perspicuous |
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| (adjective) transmitting light; able to be seen through with clarity | Synonyms: crystal clear, crystalline, lucid, pellucid, transparent |
| (adjective) clear and bright | Synonyms: liquid |
| lumpen | (adjective) mentally sluggish | Synonyms: lumpish, unthinking |
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| lumpish | (adjective) mentally sluggish | Synonyms: lumpen, unthinking |
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| lumpy | (adjective) having lumps; not smooth and even in texture | - |
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| (adjective) like or containing small sticky lumps | Synonyms: chunky |
| lymphatic | (adjective) of or relating to or produced by lymph | - |
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| lymphocytic | (adjective) of or relating to lymphocytes | - |
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| lymphoid | (adjective) resembling lymph or lymphatic tissues | - |
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| noncompetitive | (adjective) not involving competition or competitiveness | - |
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| noncompliant | (adjective) boldly resisting authority or an opposing force | Synonyms: defiant |
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| noncomprehensive | (adjective) not comprehensive | Synonyms: incomprehensive |
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| nonexempt | (adjective) (of persons) not exempt from an obligation or liability | - |
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| (adjective) (of goods or funds) subject to taxation | Synonyms: taxable |
| nymphomaniac | (adjective) (used of women) affected with excessive sexual desire | Synonyms: nymphomaniacal |
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| nymphomaniacal | (adjective) (used of women) affected with excessive sexual desire | Synonyms: nymphomaniac |
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| olympian | (adjective) far beyond what is usual in magnitude or degree | Synonyms: exceeding, exceptional, prodigious, surpassing |
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| (adjective) majestic in manner or bearing; superior to mundane matters | Synonyms: majestic |
| pampering | (adjective) gratifying tastes, appetites, or desires | - |
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| parasympathetic | (adjective) of or relating to the parasympathetic nervous system | - |
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| parasympathomimetic | (adjective) having an effect similar to that resulting from stimulation of the parasympathetic nervous system | - |
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| pemphigous | (adjective) of or relating to or manifesting pemphigus | - |
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| peremptory | (adjective) putting an end to all debate or action | - |
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| (adjective) offensively self-assured or given to exercising usually unwarranted power | Synonyms: autocratic, bossy, dominating, high-and-mighty, magisterial |
| (adjective) not allowing contradiction or refusal | - |
| pimpled | (adjective) (of complexion) blemished by imperfections of the skin | Synonyms: acned, pimply, pustulate |
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| pimply | (adjective) (of complexion) blemished by imperfections of the skin | Synonyms: acned, pimpled, pustulate |
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| plump | (adjective) sufficiently fat so as to have a pleasing fullness of figure | Synonyms: chubby, embonpoint |
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| plumping | (adjective) very large; of exceptional size for its kind | - |
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| pompous | (adjective) characterized by pomp and ceremony and stately display | Synonyms: ceremonious |
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| (adjective) puffed up with vanity | Synonyms: grandiloquent, overblown, pontifical, portentous |
| preemptive | (adjective) designed or having the power to deter or prevent an anticipated situation or occurrence | Synonyms: pre-emptive |
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| presumptive | (adjective) affording reasonable grounds for belief or acceptance | - |
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| (adjective) having a reasonable basis for belief or acceptance | - |
| presumptuous | (adjective) excessively forward | Synonyms: assuming, assumptive |
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| presymptomatic | (adjective) of or relating to the early phases of a disease when accurate diagnosis is not possible because symptoms of the disease have not yet appeared | Synonyms: preclinical |
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| prompt | (adjective) performed with little or no delay | Synonyms: immediate, quick, straightaway |
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| (adjective) according to schedule or without delay; on time | - |
| (adjective) ready and willing or quick to act | - |
| pumped | (adjective) tense with excitement and enthusiasm as from a rush of adrenaline | Synonyms: pumped-up, pumped up, wired |
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| rampageous | (adjective) displaying raging violence; often destructive | - |
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| rampant | (adjective) (of a plant) having a lush and unchecked growth | - |
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| (adjective) rearing on left hind leg with forelegs elevated and head usually in profile | Synonyms: rearing |
| (adjective) unrestrained and violent | - |
| redemptional | (adjective) of or relating to or resulting in redemption | Synonyms: redemptive, redemptory |
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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 |
| redemptory | (adjective) of or relating to or resulting in redemption | Synonyms: redemptional, redemptive |
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| rumpled | (adjective) in disarray; extremely disorderly | Synonyms: disheveled, dishevelled, frowzled, tousled |
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| scrimpy | (adjective) deficient in amount or quality or extent | Synonyms: meager, meagerly, meagre, stingy |
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| scrumptious | (adjective) extremely pleasing to the sense of taste | Synonyms: delectable, delicious, luscious, pleasant-tasting, toothsome, yummy |
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| semiempirical | (adjective) relying to some extent on observation or experiment | - |
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| sempiternal | (adjective) having no known beginning and presumably no end | Synonyms: dateless, endless |
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| shrimpy | (adjective) (used especially of persons) of inferior size | Synonyms: puny, runty |
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| simple | (adjective) (botany) of leaf shapes; of leaves having no divisions or subdivisions | Synonyms: unsubdivided |
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| (adjective) having few parts; not complex or complicated or involved | - |
| (adjective) easy and not involved or complicated | Synonyms: elementary, uncomplicated, unproblematic |
| (adjective) exhibiting childlike simplicity and credulity | Synonyms: childlike, dewy-eyed, round-eyed, wide-eyed |
| (adjective) unornamented | - |
| (adjective) lacking mental capacity and subtlety | Synonyms: dim-witted, simple-minded |
| (adjective) apart from anything else; without additions or modifications | Synonyms: bare, mere |
| simplex | (adjective) having only one part or element | - |
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| (adjective) allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time | - |
| simplistic | (adjective) characterized by extreme and often misleading simplicity | - |
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| skimpy | (adjective) containing little excess | Synonyms: lean |
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| (adjective) (of clothing) revealing the body | Synonyms: scanty |
| spaciotemporal | (adjective) existing in both space and time; having both spatial extension and temporal duration | Synonyms: spatiotemporal |
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| spatiotemporal | (adjective) of or relating to space and time together (having both spatial extension and temporal duration) | - |
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| (adjective) existing in both space and time; having both spatial extension and temporal duration | Synonyms: spaciotemporal |
| stormproof | (adjective) protected against or able to withstand storms | - |
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| stumpy | (adjective) short and thick; as e.g. having short legs and heavy musculature | Synonyms: chunky, dumpy, low-set, squat, squatty |
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| sumptuary | (adjective) regulating or controlling expenditure or personal behavior | - |
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| sumptuous | (adjective) ostentatiously rich and superior in quality | Synonyms: deluxe, gilded, grand, lush, luxurious, opulent, princely |
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| superimposed | (adjective) with one layer on top of another | Synonyms: layered |
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| (adjective) placed on or over something else | Synonyms: overlying |
| swampy | (adjective) (of soil) soft and watery | Synonyms: boggy, marshy, miry, mucky, muddy, quaggy, sloppy, sloughy, soggy, squashy, waterlogged |
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| sympathetic | (adjective) expressing or feeling or resulting from sympathy or compassion or friendly fellow feelings; disposed toward | - |
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| (adjective) (of characters in literature or drama) evoking empathic or sympathetic feelings | Synonyms: appealing, likable, likeable |
| (adjective) of or relating to the sympathetic nervous system | - |
| (adjective) relating to vibrations that occur as a result of vibrations in a nearby body | Synonyms: harmonic |
| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, charitable, good-hearted, kindly, large-hearted, openhearted |
| (adjective) having similar disposition and tastes | - |
| sympathomimetic | (adjective) relating to epinephrine (its release or action) | Synonyms: adrenergic |
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| sympatric | (adjective) (of biological species or speciation) occurring in the same or overlapping geographical areas | - |
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| sympetalous | (adjective) having a corolla composed of partially or wholly fused petals forming a corolla shaped like a tube or funnel | Synonyms: gamopetalous |
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