| inapplicable | (adjective) not capable of being applied | Synonyms: unsuitable |
|---|
| inappreciable | (adjective) too small to make a significant difference | - |
|---|
| inarguable | (adjective) against which no argument can be made | Synonyms: unarguable |
|---|
| incalculable | (adjective) not able to be computed or enumerated | - |
|---|
| (adjective) too much to be measured | Synonyms: untold |
| incapable | (adjective) (followed by `of') lacking capacity or ability | - |
|---|
| (adjective) (followed by `of') not having the temperament or inclination for | - |
| (adjective) not meeting requirements | Synonyms: incompetent, unequal to |
| (adjective) not being susceptible to or admitting of something (usually followed by `of') | - |
| incognizable | (adjective) incapable of being perceived or known | Synonyms: incognoscible |
|---|
| incommensurable | (adjective) not having a common factor | - |
|---|
| (adjective) impossible to measure or compare in value or size or excellence | - |
| incommutable | (adjective) not subject to alteration or change | - |
|---|
| (adjective) not interchangeable or able to substitute one for another | - |
| incomparable | (adjective) such that comparison is impossible; unsuitable for comparison or lacking features that can be compared | Synonyms: uncomparable |
|---|
| incomputable | (adjective) beyond calculation or measure | Synonyms: immeasurable, inestimable |
|---|
| inconceivable | (adjective) totally unlikely | Synonyms: impossible, out of the question, unimaginable |
|---|
| inconsiderable | (adjective) too small or unimportant to merit attention | - |
|---|
| inconsolable | (adjective) sad beyond comforting; incapable of being consoled | Synonyms: disconsolate, unconsolable |
|---|
| incontestable | (adjective) incapable of being contested or disputed | Synonyms: incontestible |
|---|
| (adjective) not open to question; obviously true | Synonyms: indisputable, undisputable |
| inculpable | (adjective) free of guilt; not subject to blame | Synonyms: blameless, irreproachable, unimpeachable |
|---|
| incurable | (adjective) incapable of being cured | - |
|---|
| (adjective) unalterable in disposition or habits | - |
| indecipherable | (adjective) not easily deciphered | Synonyms: unclear, undecipherable, unreadable |
|---|
| (adjective) impossible to determine the meaning of | - |
| indefatigable | (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: tireless, unflagging, unwearying |
|---|
| indefinable | (adjective) defying expression or description | Synonyms: indescribable, ineffable, unspeakable, untellable, unutterable |
|---|
| (adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: undefinable |
| indescribable | (adjective) defying expression or description | Synonyms: indefinable, ineffable, unspeakable, untellable, unutterable |
|---|
| indeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: undeterminable |
|---|
| (adjective) incapable of being definitely ascertained or calculated | - |
| indictable | (adjective) liable to be accused, or cause for such liability | Synonyms: chargeable |
|---|
| indispensable | (adjective) not to be dispensed with; essential | - |
|---|
| (adjective) absolutely necessary; vitally necessary | Synonyms: essential |
| (adjective) unavoidable | - |
| indisputable | (adjective) impossible to doubt or dispute | Synonyms: sure |
|---|
| (adjective) not open to question; obviously true | Synonyms: incontestable, undisputable |
| indistinguishable | (adjective) not capable of being distinguished or differentiated | Synonyms: undistinguishable |
|---|
| (adjective) exactly alike; incapable of being perceived as different | Synonyms: identical |
| indomitable | (adjective) impossible to subdue | Synonyms: never-say-die, unsubduable |
|---|
| indubitable | (adjective) too obvious to be doubted | Synonyms: beyond doubt |
|---|
| ineffable | (adjective) defying expression or description | Synonyms: indefinable, indescribable, unspeakable, untellable, unutterable |
|---|
| (adjective) too sacred to be uttered | Synonyms: unnameable, unspeakable, unutterable |
| ineluctable | (adjective) impossible to avoid or evade | Synonyms: inescapable, unavoidable |
|---|
| inequitable | (adjective) not equitable or fair | Synonyms: unjust |
|---|
| ineradicable | (adjective) not able to be destroyed or rooted out | - |
|---|
| inerrable | (adjective) not liable to error | Synonyms: inerrant, unerring |
|---|
| inescapable | (adjective) impossible to avoid or evade | Synonyms: ineluctable, unavoidable |
|---|
| inestimable | (adjective) beyond calculation or measure | Synonyms: immeasurable, incomputable |
|---|
| inevitable | (adjective) incapable of being avoided or prevented | - |
|---|
| (adjective) invariably occurring or appearing | - |
| inexcusable | (adjective) without excuse or justification | - |
|---|
| (adjective) not excusable | Synonyms: unforgivable |
| inexorable | (adjective) not to be placated or appeased or moved by entreaty | Synonyms: grim, relentless, stern, unappeasable, unforgiving, unrelenting |
|---|
| (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, adamantine, intransigent |
| inexpiable | (adjective) incapable of being atoned for | - |
|---|
| inexplicable | (adjective) incapable of being explained or accounted for | Synonyms: incomprehensible |
|---|
| inexpugnable | (adjective) incapable of being overcome, challenged or refuted | Synonyms: impregnable |
|---|
| inexpungeable | (adjective) not capable of being expunged | Synonyms: inexpungible |
|---|
| inexterminable | (adjective) incapable of extermination or extirpation | Synonyms: inextirpable |
|---|
| inextinguishable | (adjective) difficult or impossible to extinguish | - |
|---|
| inextirpable | (adjective) incapable of extermination or extirpation | Synonyms: inexterminable |
|---|
| inextricable | (adjective) not permitting extrication; incapable of being disentangled or untied | - |
|---|
| inflammable | (adjective) easily ignited | Synonyms: flammable |
|---|
| inflatable | (adjective) designed to be filled with air or gas | - |
|---|
| inhabitable | (adjective) fit for habitation | Synonyms: habitable |
|---|
| inheritable | (adjective) capable of being inherited | Synonyms: heritable |
|---|
| inhospitable | (adjective) unfavorable to life or growth | - |
|---|
| (adjective) not hospitable | - |
| inimitable | (adjective) defying imitation; matchless | - |
|---|
| injectable | (adjective) (used of drugs) capable of being injected | - |
|---|
| innumerable | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
|---|
| inoperable | (adjective) not suitable for surgery | - |
|---|
| (adjective) not able to perform its normal function | - |
| insatiable | (adjective) impossible to satisfy | Synonyms: insatiate, unsatiable |
|---|
| inscrutable | (adjective) of an obscure nature | Synonyms: cryptic, cryptical, deep, mysterious, mystifying |
|---|
| inseparable | (adjective) not capable of being separated | - |
|---|
| insolvable | (adjective) not easily solved | Synonyms: unresolvable, unsoluble, unsolvable |
|---|
| insufferable | (adjective) unbearably arrogant or conceited | - |
|---|
| (adjective) too extreme to bear | Synonyms: unsufferable |
| insuperable | (adjective) incapable of being surmounted or excelled | Synonyms: unconquerable |
|---|
| (adjective) impossible to surmount | Synonyms: insurmountable |
| insupportable | (adjective) incapable of being justified or explained | Synonyms: indefensible, unjustifiable, unwarrantable, unwarranted |
|---|
| insurable | (adjective) capable of being insured or eligible to be insured | - |
|---|
| insurmountable | (adjective) not capable of being surmounted or overcome | Synonyms: unsurmountable |
|---|
| (adjective) impossible to surmount | Synonyms: insuperable |
| interchangeable | (adjective) capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability | Synonyms: exchangeable, similar, standardised, standardized |
|---|
| (adjective) (mathematics, logic) such that the arguments or roles can be interchanged | - |
| interminable | (adjective) tiresomely long; seemingly without end | Synonyms: endless, eternal |
|---|
| interoperable | (adjective) able to exchange and use information | - |
|---|
| interpretable | (adjective) capable of being understood | Synonyms: explainable |
|---|
| intolerable | (adjective) incapable of being tolerated or endured | Synonyms: unbearable, unendurable |
|---|
| intractable | (adjective) not tractable; difficult to manage or mold | - |
|---|
| introuvable | (adjective) impossible to find | - |
|---|
| invaluable | (adjective) having incalculable monetary, intellectual, or spiritual worth | Synonyms: priceless |
|---|
| invariable | (adjective) not liable to or capable of change | - |
|---|
| inviolable | (adjective) incapable of being transgressed or dishonored | - |
|---|
| (adjective) not capable of being violated or infringed | Synonyms: absolute, infrangible |
| (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, secure, strong, unassailable, unattackable |
| (adjective) must be kept sacred | Synonyms: inviolate, sacrosanct |
| invulnerable | (adjective) immune to attack; impregnable | - |
|---|
| irreclaimable | (adjective) insusceptible of reform | Synonyms: irredeemable, unredeemable, unreformable |
|---|
| irreconcilable | (adjective) impossible to reconcile | Synonyms: unreconcilable |
|---|
| irrecoverable | (adjective) incapable of being recovered or regained | Synonyms: unrecoverable |
|---|
| irredeemable | (adjective) (of paper money) not convertible into coin at the pleasure of the holder | - |
|---|
| (adjective) insusceptible of reform | Synonyms: irreclaimable, unredeemable, unreformable |
| irrefutable | (adjective) impossible to deny or disprove | Synonyms: incontrovertible, positive |
|---|
| irremediable | (adjective) impossible to remedy or correct or redress | - |
|---|
| irremovable | (adjective) incapable of being removed or away or dismiss | - |
|---|
| irreparable | (adjective) impossible to repair, rectify, or amend | - |
|---|
| irreplaceable | (adjective) impossible to replace | Synonyms: unreplaceable |
|---|
| irreproachable | (adjective) free of guilt; not subject to blame | Synonyms: blameless, inculpable, unimpeachable |
|---|
| irretrievable | (adjective) impossible to recover or recoup or overcome | Synonyms: unretrievable |
|---|
| irrevocable | (adjective) incapable of being retracted or revoked | Synonyms: irrevokable |
|---|
| irrevokable | (adjective) incapable of being retracted or revoked | Synonyms: irrevocable |
|---|
| irritable | (adjective) easily irritated or annoyed | Synonyms: cranky, fractious, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
|---|
| (adjective) capable of responding to stimuli | Synonyms: excitable |
| (adjective) abnormally sensitive to a stimulus | - |
| isolable | (adjective) capable of being isolated or disjoined | - |
|---|
| judicable | (adjective) capable of being judged or decided | - |
|---|
| justifiable | (adjective) capable of being justified | - |
|---|
| killable | (adjective) fit to kill, especially for food | - |
|---|
| knowable | (adjective) capable of being known | Synonyms: cognisable, cognizable, cognoscible |
|---|
| knowledgeable | (adjective) highly educated; having extensive information or understanding | Synonyms: knowing, learned, lettered, well-educated, well-read |
|---|
| (adjective) thoroughly acquainted through study or experience | Synonyms: intimate, versed |
| (adjective) alert and fully informed | Synonyms: knowing |
| lamentable | (adjective) bad; unfortunate | Synonyms: deplorable, distressing, pitiful, sad, sorry |
|---|
| laudable | (adjective) worthy of high praise | Synonyms: applaudable, commendable, praiseworthy |
|---|
| laughable | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, idiotic, ludicrous, nonsensical, preposterous, ridiculous |
|---|
| (adjective) arousing or provoking laughter | Synonyms: amusing, comic, comical, funny, mirthful, risible |
| lendable | (adjective) available for lending | - |
|---|
| liable | (adjective) at risk of or subject to experiencing something usually unpleasant | Synonyms: apt |
|---|
| (adjective) held legally responsible | - |
| (adjective) (often followed by `to') likely to be affected with | Synonyms: nonimmune, nonresistant, unresistant |
| (adjective) subject to legal action | - |
| likable | (adjective) (of characters in literature or drama) evoking empathic or sympathetic feelings | Synonyms: appealing, likeable, sympathetic |
|---|
| (adjective) easy to like; agreeable | Synonyms: likeable |