| 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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| infallible | (adjective) incapable of failure or error | - |
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| infamous | (adjective) known widely and usually unfavorably | Synonyms: ill-famed, notorious |
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| infantile | (adjective) of or relating to infants or infancy | - |
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| (adjective) indicating a lack of maturity | Synonyms: childish |
| (adjective) being or befitting or characteristic of an infant | - |
| infatuated | (adjective) marked by foolish or unreasoning fondness | Synonyms: enamored, in love, potty, smitten, soft on, taken with |
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| infeasible | (adjective) not capable of being carried out or put into practice | Synonyms: impracticable, unfeasible, unworkable |
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| infected | (adjective) containing or resulting from disease-causing organisms | Synonyms: septic |
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| infectious | (adjective) easily spread | - |
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| (adjective) of or relating to infection | - |
| (adjective) caused by infection or capable of causing infection | Synonyms: infective |
| infective | (adjective) caused by infection or capable of causing infection | Synonyms: infectious |
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| (adjective) able to cause disease | Synonyms: morbific, pathogenic |
| infelicitous | (adjective) not appropriate in application; defective | - |
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| (adjective) marked by or producing unhappiness | Synonyms: unhappy |
| inferential | (adjective) relating to or having the nature of illation or inference | Synonyms: illative |
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| (adjective) derived or capable of being derived by inference | - |
| (adjective) based on interpretation; not directly expressed | - |
| (adjective) of reasoning; proceeding from general premisses to a necessary and specific conclusion | - |
| (adjective) resembling or dependent on or arrived at by inference | Synonyms: illative |
| inferior | (adjective) written or printed below and to one side of another character | Synonyms: subscript |
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| (adjective) of or characteristic of low rank or importance | - |
| (adjective) of low or inferior quality | - |
| (adjective) having an orbit between the sun and the Earth's orbit | - |
| (adjective) lower than a given reference point | - |
| (adjective) falling short of some prescribed norm | Synonyms: deficient, substandard |
| infernal | (adjective) being of the underworld | - |
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| (adjective) characteristic of or resembling Hell | - |
| (adjective) of or pertaining to or characteristic of a very uncontrolled and intense fire | - |
| (adjective) expletives used informally as intensifiers | Synonyms: blame, blamed, blasted, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned |
| (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, diabolical, fiendish, hellish, satanic, unholy |
| infertile | (adjective) incapable of reproducing | Synonyms: sterile, unfertile |
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| infinite | (adjective) having no limits or boundaries in time or space or extent or magnitude | - |
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| (adjective) (of verbs) not having tense, person, or number (as a participle or gerund or infinitive) | Synonyms: non-finite, nonfinite |
| (adjective) total and all-embracing | - |
| (adjective) too numerous to be counted | Synonyms: countless, innumerable, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
| infinitesimal | (adjective) infinitely or immeasurably small | Synonyms: minute |
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| infinitival | (adjective) relating to or formed with the infinitive | - |
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| infirm | (adjective) lacking bodily or muscular strength or vitality | Synonyms: debile, decrepit, feeble, rickety, sapless, weak, weakly |
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| (adjective) lacking firmness of will or character or purpose | - |
| inflamed | (adjective) adorned with tongues of flame | - |
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| (adjective) lighted with red light as if with flames | Synonyms: ablaze, reddened |
| (adjective) resulting from inflammation; hot and swollen and reddened | - |
| inflammable | (adjective) easily ignited | Synonyms: flammable |
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| inflammatory | (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, instigative, rabble-rousing, seditious |
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| (adjective) characterized or caused by inflammation | - |
| inflatable | (adjective) designed to be filled with air or gas | - |
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| inflated | (adjective) pretentious (especially with regard to language or ideals) | Synonyms: high-flown, high-sounding |
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| (adjective) enlarged beyond truth or reasonableness | Synonyms: hyperbolic |
| inflationary | (adjective) associated with or tending to cause increases in inflation | - |
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| inflected | (adjective) (of the voice) altered in tone or pitch | - |
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| (adjective) showing alteration in form (especially by the addition of affixes) | - |
| inflectional | (adjective) characterized by inflections indicating grammatical distinctions | - |
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| inflexible | (adjective) resistant to being bent | - |
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| (adjective) incapable of change | - |
| (adjective) not making concessions | Synonyms: sturdy, uncompromising |
| (adjective) incapable of adapting or changing to meet circumstances | Synonyms: rigid, unbending |
| inflowing | (adjective) flowing inward | Synonyms: influent |
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| influent | (adjective) flowing inward | Synonyms: inflowing |
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| influential | (adjective) having or exercising influence or power | - |
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| informal | (adjective) not formal | - |
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| (adjective) used of spoken and written language | - |
| (adjective) having or fostering a warm or friendly and informal atmosphere | Synonyms: cosy, cozy, intimate |
| (adjective) not officially recognized or controlled | Synonyms: loose |
| informational | (adjective) relating to or having the nature of information | - |
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| informative | (adjective) providing or conveying information | Synonyms: informatory |
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| (adjective) tending to increase knowledge or dissipate ignorance | Synonyms: enlightening, illuminating |
| (adjective) serving to instruct or enlighten or inform | Synonyms: instructive |
| informatory | (adjective) providing or conveying information | Synonyms: informative |
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| informed | (adjective) having much knowledge or education | - |
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| infrahuman | (adjective) belonging to a group below humans in evolutionary development | - |
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| inframaxillary | (adjective) relating to the lower jaw | Synonyms: mandibular |
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| infrangible | (adjective) not capable of being violated or infringed | Synonyms: absolute, inviolable |
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| (adjective) difficult or impossible to break or separate into parts | - |
| infrared | (adjective) having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end | - |
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| infrasonic | (adjective) having frequencies below those of audible sound | - |
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| infrequent | (adjective) not frequent; not occurring regularly or at short intervals | - |
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| infuriated | (adjective) marked by extreme anger | Synonyms: angered, enraged, furious, maddened |
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| infuriating | (adjective) extremely annoying or displeasing | Synonyms: exasperating, maddening, vexing |
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| ingenious | (adjective) showing inventiveness and skill | Synonyms: clever, cunning |
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| ingenuous | (adjective) characterized by an inability to mask your feelings; not devious | Synonyms: artless |
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| (adjective) lacking in sophistication or worldliness | Synonyms: innocent |
| inglorious | (adjective) not bringing honor and glory | - |
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| (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, disgraceful, ignominious, opprobrious, shameful |
| ingrained | (adjective) (used especially of ideas or principles) deeply rooted; firmly fixed or held | Synonyms: deep-rooted, deep-seated, implanted, planted |
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| ingratiating | (adjective) calculated to please or gain favor | Synonyms: ingratiatory, insinuating |
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| (adjective) capable of winning favor | - |
| ingratiatory | (adjective) calculated to please or gain favor | Synonyms: ingratiating, insinuating |
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| (adjective) pleasingly persuasive or intended to persuade | Synonyms: coaxing |
| ingrowing | (adjective) growing abnormally into the flesh | Synonyms: ingrown |
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| ingrown | (adjective) growing abnormally into the flesh | Synonyms: ingrowing |
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| inguinal | (adjective) of or relating to or near the groin | - |
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| inhabitable | (adjective) fit for habitation | Synonyms: habitable |
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| inhabited | (adjective) having inhabitants; lived in | - |
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| inhalant | (adjective) inhaling or serving for inhalation | - |
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| inharmonic | (adjective) lacking in harmony | Synonyms: discordant, disharmonious, dissonant |
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| inharmonious | (adjective) not in harmony | Synonyms: unharmonious |
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| (adjective) lacking in harmony of parts | - |
| inherent | (adjective) in the nature of something though not readily apparent | Synonyms: implicit in, underlying |
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| (adjective) existing as an essential constituent or characteristic | Synonyms: built-in, constitutional, inbuilt, integral |
| inheritable | (adjective) capable of being inherited | Synonyms: heritable |
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| inherited | (adjective) occurring among members of a family usually by heredity | Synonyms: familial, genetic, hereditary, transmissible, transmitted |
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| inheriting | (adjective) having the legal right to inherit | - |
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| inhibited | (adjective) held back or restrained or prevented | - |
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| inhibitory | (adjective) restrictive of action | Synonyms: repressing, repressive |
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| inhomogeneous | (adjective) not homogeneous | Synonyms: nonuniform |
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| inhospitable | (adjective) unfavorable to life or growth | - |
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| (adjective) not hospitable | - |
| inhuman | (adjective) without compunction or human feeling | Synonyms: cold-blooded, cold, insensate |
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| (adjective) belonging to or resembling something nonhuman | - |
| inhumane | (adjective) lacking and reflecting lack of pity or compassion | - |
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| inhumed | (adjective) placed in a grave | Synonyms: buried, interred |
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| inimical | (adjective) not friendly | Synonyms: unfriendly |
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