| inebriated | (adjective) stupefied or excited by a chemical substance (especially alcohol) | Synonyms: drunk, gone, intoxicated, ripped |
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| inedible | (adjective) not suitable for food | Synonyms: uneatable |
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| ineffable | (adjective) defying expression or description | Synonyms: indefinable, indescribable, unspeakable, untellable, unutterable |
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| (adjective) too sacred to be uttered | Synonyms: unnameable, unspeakable, unutterable |
| ineffective | (adjective) not producing an intended effect | Synonyms: ineffectual, uneffective |
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| (adjective) lacking in power or forcefulness | Synonyms: ineffectual, unable |
| (adjective) lacking the ability or skill to perform effectively; inadequate | Synonyms: inefficient |
| ineffectual | (adjective) not producing an intended effect | Synonyms: ineffective, uneffective |
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| (adjective) lacking in power or forcefulness | Synonyms: ineffective, unable |
| (adjective) producing no result or effect | Synonyms: futile, meaningless, otiose, unavailing |
| inefficacious | (adjective) lacking the power to produce a desired effect | - |
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| inefficient | (adjective) not producing desired results; wasteful | - |
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| (adjective) lacking the ability or skill to perform effectively; inadequate | Synonyms: ineffective |
| inelaborate | (adjective) not elaborate; lacking rich or complex detail | Synonyms: unelaborate |
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| inelastic | (adjective) not elastic | - |
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| inelegant | (adjective) lacking in refinement or grace or good taste | - |
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| ineligible | (adjective) not eligible | - |
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| (adjective) prohibited by official rules | - |
| ineluctable | (adjective) impossible to avoid or evade | Synonyms: inescapable, unavoidable |
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| inept | (adjective) generally incompetent and ineffectual | Synonyms: feckless |
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| (adjective) not elegant or graceful in expression | Synonyms: awkward, clumsy, cumbersome, ill-chosen, inapt |
| (adjective) revealing lack of perceptiveness or judgment or finesse | Synonyms: tactless |
| 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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| inerrant | (adjective) not liable to error | Synonyms: inerrable, unerring |
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| inert | (adjective) slow and apathetic | Synonyms: sluggish, soggy, torpid |
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| (adjective) unable to move or resist motion | - |
| (adjective) having only a limited ability to react chemically; chemically inactive | Synonyms: indifferent, neutral |
| inertial | (adjective) of or relating to inertia | - |
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| inescapable | (adjective) impossible to avoid or evade | Synonyms: ineluctable, unavoidable |
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| inessential | (adjective) not basic or fundamental | Synonyms: unessential |
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| (adjective) not absolutely necessary | - |
| 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 | - |
| inexact | (adjective) not exact | - |
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| inexcusable | (adjective) without excuse or justification | - |
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| (adjective) not excusable | Synonyms: unforgivable |
| inexhaustible | (adjective) incapable of being entirely consumed or used up | - |
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| (adjective) that cannot be entirely consumed or used up | Synonyms: unlimited |
| 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 |
| inexpedient | (adjective) not suitable or advisable | - |
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| (adjective) not appropriate to the purpose | Synonyms: unwise |
| inexpensive | (adjective) relatively low in price or charging low prices | Synonyms: cheap |
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| inexperienced | (adjective) lacking practical experience or training | Synonyms: inexperient |
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| inexperient | (adjective) lacking practical experience or training | Synonyms: inexperienced |
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| inexpert | (adjective) lacking professional skill or expertise | Synonyms: amateur, amateurish, unskilled |
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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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| inexplicit | (adjective) implied though not directly expressed; inherent in the nature of something | Synonyms: implicit |
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| inexpressible | (adjective) defying expression | Synonyms: unexpressible |
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| inexpressive | (adjective) not expressive | - |
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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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| inexpungible | (adjective) not capable of being expunged | Synonyms: inexpungeable |
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| inextensible | (adjective) not extensile | Synonyms: nonextensile, nonprotractile |
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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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