| inimitable | (adjective) defying imitation; matchless | - |
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| iniquitous | (adjective) characterized by iniquity; wicked because it is believed to be a sin | Synonyms: sinful, ungodly |
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| initial | (adjective) occurring at the beginning | - |
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| initiative | (adjective) serving to set in motion | Synonyms: first, inaugural, initiatory, maiden |
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| initiatory | (adjective) serving to set in motion | Synonyms: first, inaugural, initiative, maiden |
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| injectable | (adjective) (used of drugs) capable of being injected | - |
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| injudicious | (adjective) lacking or showing lack of judgment or discretion; unwise | - |
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| injured | (adjective) harmed | - |
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| (adjective) emotionally hurt or upset or annoyed | Synonyms: offended, pained |
| injurious | (adjective) harmful to living things | Synonyms: deleterious, hurtful |
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| inky | (adjective) of the color of black ink | Synonyms: ink-black, inky-black |
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| inlaid | (adjective) adorned by inlays | - |
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| inland | (adjective) situated away from an area's coast or border | - |
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| inmost | (adjective) situated or occurring farthest within | Synonyms: innermost |
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| (adjective) being deepest within the self | Synonyms: innermost |
| innate | (adjective) not established by conditioning or learning | Synonyms: unconditioned, unlearned |
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| (adjective) being talented through inherited qualities | Synonyms: born, natural |
| (adjective) present at birth but not necessarily hereditary; acquired during fetal development | Synonyms: congenital, inborn |
| inner | (adjective) located or occurring within or closer to a center | - |
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| (adjective) exclusive to a center; especially a center of influence | - |
| (adjective) inside or closer to the inside of the body | - |
| (adjective) innermost or essential | Synonyms: internal, intimate |
| (adjective) located inward | Synonyms: interior, internal |
| (adjective) confined to an exclusive group | Synonyms: inside, privileged |
| innermost | (adjective) situated or occurring farthest within | Synonyms: inmost |
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| (adjective) being deepest within the self | Synonyms: inmost |
| innocent | (adjective) free from evil or guilt | Synonyms: clean-handed, guiltless |
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| (adjective) lacking intent or capacity to injure | Synonyms: innocuous |
| (adjective) lacking in sophistication or worldliness | Synonyms: ingenuous |
| (adjective) completely wanting or lacking | Synonyms: barren, destitute, devoid, free |
| (adjective) (used of things) lacking sense or awareness | - |
| (adjective) not knowledgeable about something specified | Synonyms: unacquainted |
| (adjective) free from sin | Synonyms: impeccant, sinless |
| innocuous | (adjective) not injurious to physical or mental health | - |
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| (adjective) lacking intent or capacity to injure | Synonyms: innocent |
| (adjective) not causing disapproval | Synonyms: unobjectionable |
| innovational | (adjective) being or producing something like nothing done or experienced or created before | Synonyms: groundbreaking, innovative |
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| innovative | (adjective) being or producing something like nothing done or experienced or created before | Synonyms: groundbreaking, innovational |
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| (adjective) ahead of the times | Synonyms: advanced, forward-looking, modern |
| innoxious | (adjective) having no adverse effect | - |
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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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| innumerate | (adjective) lacking knowledge and understanding of mathematical concepts and methods | - |
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| innumerous | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
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| inodorous | (adjective) having no odor | Synonyms: odorless, odourless |
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| inoffensive | (adjective) giving no offense | - |
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| (adjective) not causing anger or annoyance | Synonyms: unoffending |
| inoperable | (adjective) not suitable for surgery | - |
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| (adjective) not able to perform its normal function | - |
| inoperative | (adjective) not working or taking effect | - |
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| inopportune | (adjective) not opportune | - |
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| inordinate | (adjective) beyond normal limits | Synonyms: excessive, undue, unreasonable |
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| inorganic | (adjective) relating or belonging to the class of compounds not having a carbon basis | - |
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| (adjective) lacking the properties characteristic of living organisms | - |
| inpouring | (adjective) pouring inward | - |
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| inquiring | (adjective) given to inquiry | - |
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| inquisitive | (adjective) showing curiosity | Synonyms: questioning, speculative, wondering |
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| (adjective) inquiring or appearing to inquire | - |
| inquisitorial | (adjective) especially indicating a form of prosecution in which proceedings are secret and the accused is questioned by a prosecutor who acts also as the judge | - |
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| (adjective) having the authority to conduct official investigations | - |
| (adjective) marked by inquisitive interest; especially suggestive of an ecclesiastical inquisitor | - |
| inquisitory | (adjective) diligent and thorough in inquiry or investigation | Synonyms: probing, searching |
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| insalubrious | (adjective) detrimental to health | Synonyms: unhealthful, unhealthy |
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| insane | (adjective) afflicted with or characteristic of mental derangement | - |
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| (adjective) very foolish | Synonyms: harebrained, mad |
| insanitary | (adjective) not sanitary or healthful | Synonyms: unhealthful, unsanitary |
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| insatiable | (adjective) impossible to satisfy | Synonyms: insatiate, unsatiable |
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| insatiate | (adjective) impossible to satisfy | Synonyms: insatiable, unsatiable |
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| inscribed | (adjective) cut or impressed into a surface | Synonyms: engraved, etched, graven, incised |
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| (adjective) written (by handwriting, printing, engraving, or carving) on or in a surface | - |
| inscriptive | (adjective) of or relating to an inscription | - |
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| inscrutable | (adjective) of an obscure nature | Synonyms: cryptic, cryptical, deep, mysterious, mystifying |
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| insectan | (adjective) of or relating to the class Insecta | - |
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| insecticidal | (adjective) of or relating to insecticide | - |
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| insectivorous | (adjective) (of animals and plants) feeding on insects | - |
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| insecure | (adjective) lacking self-confidence or assurance | - |
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| (adjective) lacking in security or safety | Synonyms: unsafe |
| (adjective) not firm or firmly fixed; likely to fail or give way | - |
| (adjective) not safe from attack | Synonyms: unsafe |
| insensate | (adjective) devoid of feeling and consciousness and animation | Synonyms: insentient |
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| (adjective) without compunction or human feeling | Synonyms: cold-blooded, cold, inhuman |
| insensible | (adjective) incapable of physical sensation | - |
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| (adjective) barely able to be perceived | Synonyms: indiscernible, undetectable |
| (adjective) unresponsive to stimulation | Synonyms: out of it, senseless |
| (adjective) unaware of or indifferent to | Synonyms: unaffected |
| insensitive | (adjective) not responsive to physical stimuli | - |
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| (adjective) deficient in human sensibility; not mentally or morally sensitive | - |
| insentient | (adjective) devoid of feeling and consciousness and animation | Synonyms: insensate |
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| inseparable | (adjective) not capable of being separated | - |
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| inshore | (adjective) (of winds) coming from the sea toward the land | Synonyms: onshore, shoreward |
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| (adjective) close to a shore | - |
| inside | (adjective) relating to or being on the side closer to the center or within a defined space | - |
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| (adjective) confined to an exclusive group | Synonyms: inner, privileged |
| (adjective) away from the outer edge | - |
| (adjective) being or applying to the inside of a building | - |
| insidious | (adjective) intended to entrap | - |
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| (adjective) working or spreading in a hidden and usually injurious way | Synonyms: pernicious, subtle |
| (adjective) beguiling but harmful | - |
| insightful | (adjective) exhibiting insight or clear and deep perception | - |
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| insignificant | (adjective) devoid of importance, meaning, or force | Synonyms: unimportant |
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| (adjective) signifying nothing | - |
| (adjective) of little importance or influence or power; of minor status | Synonyms: peanut |
| (adjective) small and unimpressive | Synonyms: dinky |
| insincere | (adjective) lacking sincerity | - |
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| insinuating | (adjective) calculated to please or gain favor | Synonyms: ingratiating, ingratiatory |
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| insipid | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, flavourless, savorless, savourless, vapid |
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| (adjective) lacking interest or significance or impact | Synonyms: jejune |
| insistent | (adjective) repetitive and persistent | Synonyms: repetitive |
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| (adjective) demanding attention | Synonyms: clamant, crying, exigent, instant |
| insolent | (adjective) marked by casual disrespect | Synonyms: flip, impudent, snotty-nosed |
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| (adjective) unrestrained by convention or propriety | Synonyms: audacious, bald-faced, barefaced, bodacious, brassy, brazen-faced, brazen |
| insoluble | (adjective) (of a substance) incapable of being dissolved | Synonyms: indissoluble |
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| (adjective) admitting of no solution or explanation | - |
| (adjective) without hope of solution | - |
| insolvable | (adjective) not easily solved | Synonyms: unresolvable, unsoluble, unsolvable |
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| insolvent | (adjective) unable to meet or discharge financial obligations | - |
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| insomniac | (adjective) experiencing or accompanied by sleeplessness | Synonyms: sleepless, watchful |
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| insouciant | (adjective) marked by blithe unconcern | Synonyms: casual, nonchalant |
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| inspirational | (adjective) imparting a divine influence on the mind and soul | - |
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| inspiratory | (adjective) pertaining to the drawing in phase of respiration | - |
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| inspired | (adjective) being of such surpassing excellence as to suggest inspiration by the gods | Synonyms: divine, elysian |
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| inspiring | (adjective) stimulating or exalting to the spirit | - |
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| inspiriting | (adjective) cheerfully encouraging | Synonyms: heartening |
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| inst | (adjective) in or of the present month | Synonyms: instant |
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| instagood | (adjective) likely to get many upvotes on Instagram | - |
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| instant | (adjective) occurring with no delay | Synonyms: instantaneous |
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| (adjective) demanding attention | Synonyms: clamant, crying, exigent, insistent |
| (adjective) in or of the present month | Synonyms: inst |
| instantaneous | (adjective) occurring with no delay | Synonyms: instant |
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| instigative | (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, inflammatory, rabble-rousing, seditious |
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| instinct | (adjective) (followed by `with') deeply filled or permeated | Synonyms: imbued, replete |
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| instinctive | (adjective) unthinking; prompted by (or as if by) instinct | Synonyms: natural |
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| institutional | (adjective) organized as or forming an institution | - |
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| (adjective) relating to or constituting or involving an institution | - |
| (adjective) characteristic or suggestive of an institution especially in being uniform or dull or unimaginative | Synonyms: uninteresting |
| institutionalised | (adjective) officially placed in or committed to a specialized institution | Synonyms: institutionalized |
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| (adjective) given the character of an institution or incorporated into a structured and usually well-established system | Synonyms: institutionalized |
| institutionalized | (adjective) officially placed in or committed to a specialized institution | Synonyms: institutionalised |
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| (adjective) given the character of an institution or incorporated into a structured and usually well-established system | Synonyms: institutionalised |
| instructional | (adjective) of or relating to or used in instruction | - |
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| instructive | (adjective) serving to instruct or enlighten or inform | Synonyms: informative |
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| instrumental | (adjective) relating to or designed for or performed on musical instruments | - |
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| (adjective) serving or acting as a means or aid | Synonyms: implemental, subservient |
| insubordinate | (adjective) not submissive to authority | - |
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| (adjective) disposed to or engaged in defiance of established authority | Synonyms: resistant, resistive |
| insubstantial | (adjective) lacking material form or substance; unreal | Synonyms: unreal, unsubstantial |
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| (adjective) lacking in nutritive value | - |
| (adjective) lacking solidity or strength | Synonyms: flimsy |
| insufferable | (adjective) unbearably arrogant or conceited | - |
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| (adjective) too extreme to bear | Synonyms: unsufferable |
| insufficient | (adjective) of a quantity not able to fulfill a need or requirement | Synonyms: deficient |
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| insular | (adjective) relating to or characteristic of or situated on an island | - |
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| (adjective) suggestive of the isolated life of an island | - |
| (adjective) narrowly restricted in outlook or scope | Synonyms: parochial |
| insulting | (adjective) expressing extreme contempt | Synonyms: contemptuous, disdainful, scornful |
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| 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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| insured | (adjective) covered by insurance | - |
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| insurgent | (adjective) in opposition to a civil authority or government | Synonyms: seditious, subversive |
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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 |
| insurrectional | (adjective) of or relating to or given to insurrection | Synonyms: insurrectionary |
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| insurrectionary | (adjective) of or relating to or given to insurrection | Synonyms: insurrectional |
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