| ineluctable | (adjective) impossible to avoid or evade | Synonyms: inescapable, unavoidable |
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| inequitable | (adjective) not equitable or fair | Synonyms: unjust |
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| ineradicable | (adjective) not able to be destroyed or rooted out | - |
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| inerrable | (adjective) not liable to error | Synonyms: inerrant, unerring |
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| inescapable | (adjective) impossible to avoid or evade | Synonyms: ineluctable, unavoidable |
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| inestimable | (adjective) beyond calculation or measure | Synonyms: immeasurable, incomputable |
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| inevitable | (adjective) incapable of being avoided or prevented | - |
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| (adjective) invariably occurring or appearing | - |
| (noun) an unavoidable event | - |
| inevitableness | (noun) the quality of being unavoidable | Synonyms: inevitability |
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| inexcusable | (adjective) without excuse or justification | - |
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| (adjective) not excusable | Synonyms: unforgivable |
| inexorable | (adjective) not to be placated or appeased or moved by entreaty | Synonyms: grim, relentless, stern, unappeasable, unforgiving, unrelenting |
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| (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, adamantine, intransigent |
| inexorableness | (noun) mercilessness characterized by an unwillingness to relent or let up | Synonyms: inexorability, relentlessness |
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| inexpiable | (adjective) incapable of being atoned for | - |
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| inexplicable | (adjective) incapable of being explained or accounted for | Synonyms: incomprehensible |
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| inexpugnable | (adjective) incapable of being overcome, challenged or refuted | Synonyms: impregnable |
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| inexpungeable | (adjective) not capable of being expunged | Synonyms: inexpungible |
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| inexterminable | (adjective) incapable of extermination or extirpation | Synonyms: inextirpable |
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| inextinguishable | (adjective) difficult or impossible to extinguish | - |
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| inextirpable | (adjective) incapable of extermination or extirpation | Synonyms: inexterminable |
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| inextricable | (adjective) not permitting extrication; incapable of being disentangled or untied | - |
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| inflammable | (adjective) easily ignited | Synonyms: flammable |
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| inflatable | (adjective) designed to be filled with air or gas | - |
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| inhabitable | (adjective) fit for habitation | Synonyms: habitable |
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| inheritable | (adjective) capable of being inherited | Synonyms: heritable |
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| inhospitable | (adjective) unfavorable to life or growth | - |
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| (adjective) not hospitable | - |
| inhospitableness | (noun) having an unfriendly and inhospitable disposition | - |
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| (noun) the environmental condition in a region that lacks a favorable climate or terrain for life or growth | - |
| inimitable | (adjective) defying imitation; matchless | - |
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| injectable | (adjective) (used of drugs) capable of being injected | - |
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| innumerable | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
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| innumerableness | (noun) a number beyond counting | Synonyms: countlessness |
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| inoperable | (adjective) not suitable for surgery | - |
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| (adjective) not able to perform its normal function | - |
| insatiable | (adjective) impossible to satisfy | Synonyms: insatiate, unsatiable |
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| inscrutable | (adjective) of an obscure nature | Synonyms: cryptic, cryptical, deep, mysterious, mystifying |
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| inseparable | (adjective) not capable of being separated | - |
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| insolvable | (adjective) not easily solved | Synonyms: unresolvable, unsoluble, unsolvable |
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| insufferable | (adjective) unbearably arrogant or conceited | - |
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| (adjective) too extreme to bear | Synonyms: unsufferable |
| insuperable | (adjective) incapable of being surmounted or excelled | Synonyms: unconquerable |
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| (adjective) impossible to surmount | Synonyms: insurmountable |
| insupportable | (adjective) incapable of being justified or explained | Synonyms: indefensible, unjustifiable, unwarrantable, unwarranted |
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| insurable | (adjective) capable of being insured or eligible to be insured | - |
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| insurmountable | (adjective) not capable of being surmounted or overcome | Synonyms: unsurmountable |
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| (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 |
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| (adjective) (mathematics, logic) such that the arguments or roles can be interchanged | - |
| interchangeableness | (noun) the quality of being capable of exchange or interchange | Synonyms: exchangeability, fungibility, interchangeability |
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| interminable | (adjective) tiresomely long; seemingly without end | Synonyms: endless, eternal |
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| interoperable | (adjective) able to exchange and use information | - |
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| interpretable | (adjective) capable of being understood | Synonyms: explainable |
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| intolerable | (adjective) incapable of being tolerated or endured | Synonyms: unbearable, unendurable |
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| intractable | (adjective) not tractable; difficult to manage or mold | - |
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| intractableness | (noun) the trait of being hard to influence or control | Synonyms: intractability |
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| introuvable | (adjective) impossible to find | - |
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| invaluable | (adjective) having incalculable monetary, intellectual, or spiritual worth | Synonyms: priceless |
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| invaluableness | (noun) the positive quality of being precious and beyond value | Synonyms: preciousness, pricelessness, valuableness |
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| invariable | (adjective) not liable to or capable of change | - |
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| (noun) a quantity that does not vary | Synonyms: constant, constant quantity |
| invariableness | (noun) the quality of being resistant to variation | Synonyms: invariability, invariance |
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| inviolable | (adjective) incapable of being transgressed or dishonored | - |
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| (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 | - |
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| irreclaimable | (adjective) insusceptible of reform | Synonyms: irredeemable, unredeemable, unreformable |
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| irreconcilable | (adjective) impossible to reconcile | Synonyms: unreconcilable |
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| irrecoverable | (adjective) incapable of being recovered or regained | Synonyms: unrecoverable |
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| irredeemable | (adjective) (of paper money) not convertible into coin at the pleasure of the holder | - |
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| (adjective) insusceptible of reform | Synonyms: irreclaimable, unredeemable, unreformable |
| irrefutable | (adjective) impossible to deny or disprove | Synonyms: incontrovertible, positive |
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| irremediable | (adjective) impossible to remedy or correct or redress | - |
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| irremovable | (adjective) incapable of being removed or away or dismiss | - |
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| irreparable | (adjective) impossible to repair, rectify, or amend | - |
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| irreplaceable | (adjective) impossible to replace | Synonyms: unreplaceable |
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| irreplaceableness | (noun) the quality of being irreplaceable | - |
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| irreproachable | (adjective) free of guilt; not subject to blame | Synonyms: blameless, inculpable, unimpeachable |
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| irretrievable | (adjective) impossible to recover or recoup or overcome | Synonyms: unretrievable |
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| irrevocable | (adjective) incapable of being retracted or revoked | Synonyms: irrevokable |
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| irrevokable | (adjective) incapable of being retracted or revoked | Synonyms: irrevocable |
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| irritable | (adjective) easily irritated or annoyed | Synonyms: cranky, fractious, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
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| (adjective) capable of responding to stimuli | Synonyms: excitable |
| (adjective) abnormally sensitive to a stimulus | - |
| isolable | (adjective) capable of being isolated or disjoined | - |
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| judicable | (adjective) capable of being judged or decided | - |
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| justifiable | (adjective) capable of being justified | - |
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| killable | (adjective) fit to kill, especially for food | - |
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| knowable | (adjective) capable of being known | Synonyms: cognisable, cognizable, cognoscible |
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| knowledgeable | (adjective) highly educated; having extensive information or understanding | Synonyms: knowing, learned, lettered, well-educated, well-read |
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| (adjective) thoroughly acquainted through study or experience | Synonyms: intimate, versed |
| (adjective) alert and fully informed | Synonyms: knowing |
| knowledgeableness | (noun) wisdom as evidenced by the possession of knowledge | Synonyms: initiation, knowledgeability |
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| lamentable | (adjective) bad; unfortunate | Synonyms: deplorable, distressing, pitiful, sad, sorry |
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| laudable | (adjective) worthy of high praise | Synonyms: applaudable, commendable, praiseworthy |
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| laudableness | (noun) the quality of being worthy of praise | Synonyms: laudability, praiseworthiness |
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| laughable | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, idiotic, ludicrous, nonsensical, preposterous, ridiculous |
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| (adjective) arousing or provoking laughter | Synonyms: amusing, comic, comical, funny, mirthful, risible |
| lendable | (adjective) available for lending | - |
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| liable | (adjective) at risk of or subject to experiencing something usually unpleasant | Synonyms: apt |
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| (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 |
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| (adjective) easy to like; agreeable | Synonyms: likeable |
| likeable | (adjective) (of characters in literature or drama) evoking empathic or sympathetic feelings | Synonyms: appealing, likable, sympathetic |
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| (adjective) easy to like; agreeable | Synonyms: likable |
| liquefiable | (adjective) capable of being liquefied | Synonyms: liquifiable |
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| liquifiable | (adjective) capable of being liquefied | Synonyms: liquefiable |
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| livable | (adjective) fit or suitable to live in or with | Synonyms: liveable |
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| liveable | (adjective) fit or suitable to live in or with | Synonyms: livable |
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| lovable | (adjective) having characteristics that attract love or affection | Synonyms: loveable |
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| loveable | (adjective) having characteristics that attract love or affection | Synonyms: lovable |
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| maintainable | (adjective) capable of being maintained | - |
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| malleable | (adjective) capable of being shaped or bent or drawn out | Synonyms: ductile, pliable, pliant, tensile, tractile |
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| (adjective) easily influenced | Synonyms: ductile |
| manageable | (adjective) capable of being managed or controlled | - |
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| (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: accomplishable, achievable, doable, realizable |
| manageableness | (noun) the capability of being managed or controlled | Synonyms: manageability |
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| maneuverable | (adjective) capable of maneuvering or changing position | Synonyms: manoeuvrable |
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| manipulable | (adjective) easily managed (controlled or taught or molded) | Synonyms: tractable |
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| manoeuvrable | (adjective) capable of maneuvering or changing position | Synonyms: maneuverable |
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| marketable | (adjective) capable of being marketed | - |
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| (adjective) being in demand by especially employers | - |
| (adjective) fit to be offered for sale | Synonyms: merchantable, sellable, vendable, vendible |
| marriageable | (adjective) of girls or women who are eligible to marry | Synonyms: nubile |
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| measurable | (adjective) capable of being measured | Synonyms: mensurable |
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| (adjective) of distinguished importance | - |