| indescribably | (adverb) to an inexpressible degree | Synonyms: ineffably, inexpressibly, unspeakably, unutterably |
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| indestructibility | (noun) the strength to resist destruction | - |
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| indestructible | (adjective) not easily destroyed | - |
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| (adjective) very long lasting | Synonyms: durable, perdurable, undestroyable |
| indigestibility | (noun) the property of being difficult to digest | Synonyms: indigestibleness |
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| indigestible | (adjective) digested with difficulty | - |
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| indigestibleness | (noun) the property of being difficult to digest | Synonyms: indigestibility |
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| indiscernibility | (noun) The state or characteristic of being indiscernible; inability to be observed. | - |
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| indiscernible | (adjective) difficult or impossible to perceive or discern | - |
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| (adjective) barely able to be perceived | Synonyms: insensible, undetectable |
| indivisibility | (noun) (arithmetic) The state of being impossible to divide by a specific integer without leaving a remainder. | - |
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| indivisible | (adjective) impossible of undergoing division | - |
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| inedible | (adjective) not suitable for food | Synonyms: uneatable |
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| ineligibility | (noun) the quality or state of being ineligible | - |
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| ineligible | (adjective) not eligible | - |
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| (adjective) prohibited by official rules | - |
| inexhaustibility | (noun) The state or condition of being impossible to exhaust; of being unlimited. | - |
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| 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 |
| inexhaustibly | (adverb) with indefatigable energy | Synonyms: indefatigably, tirelessly |
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| inexpressible | (adjective) defying expression | Synonyms: unexpressible |
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| inexpressibly | (adverb) to an inexpressible degree | Synonyms: indescribably, ineffably, unspeakably, unutterably |
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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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| infallibility | (noun) the quality of never making an error | - |
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| infallible | (adjective) incapable of failure or error | - |
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| infeasibility | (noun) the quality of not being doable | Synonyms: unfeasibility |
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| infeasible | (adjective) not capable of being carried out or put into practice | Synonyms: impracticable, unfeasible, unworkable |
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| inflexibility | (noun) the quality of being rigid and rigorously severe | Synonyms: rigidity, rigidness |
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| (noun) a lack of physical flexibility | Synonyms: inflexibleness |
| 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 |
| inflexibleness | (noun) a lack of physical flexibility | Synonyms: inflexibility |
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| inflexibly | (adverb) in an inflexible manner | - |
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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 | - |
| infundibulum | (noun) any of various funnel-shaped parts of the body (but especially the hypophyseal stalk) | - |
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| inhibit | (verb) prohibit, forbid, or prevent from doing something | - |
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| (verb) make (someone) self-conscious and as a result unable to act naturally | - |
| (verb) consciously restrain from showing; of emotions, desires, impulses, or behavior | Synonyms: bottle up, suppress |
| (verb) limit, block, or decrease the action or function of | - |
| inhibited | (adjective) held back or restrained or prevented | - |
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| inhibition | (noun) (psychology) the conscious exclusion of unacceptable thoughts or desires | Synonyms: suppression |
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| (noun) the action of prohibiting or inhibiting or forbidding (or an instance thereof) | Synonyms: forbiddance, prohibition |
| (noun) the quality of being inhibited | - |
| (noun) (physiology) the process whereby nerves can retard or prevent the functioning of an organ or part | - |
| inhibitor | (noun) a substance that retards or stops an activity | - |
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| inhibitory | (adjective) restrictive of action | Synonyms: repressing, repressive |
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| inscribe | (verb) mark with one's signature | Synonyms: autograph |
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| (verb) address, (a work of literature) in a style less formal than a dedication | - |
| (verb) write, engrave, or print as a lasting record | - |
| (verb) convert ordinary language into code | Synonyms: cipher, code, cypher, encipher, encrypt, write in code |
| (verb) carve, cut, or etch into a material or surface | Synonyms: engrave, grave, scratch |
| (verb) draw within a figure so as to touch in as many places as possible | - |
| (verb) register formally as a participant or member | Synonyms: enrol, enroll, enter, raise, recruit |
| 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 | - |
| insensibility | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callosity, callousness, hardness, unfeelingness |
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| (noun) a lack of sensibility | - |
| 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 |
| insensibly | (adverb) in a numb manner; without feeling | Synonyms: numbly |
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| insusceptible | (adjective) not susceptible to | Synonyms: unsusceptible |
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| intangibility | (noun) the quality of being intangible and not perceptible by touch | Synonyms: impalpability, intangibleness |
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| intangible | (adjective) incapable of being perceived by the senses especially the sense of touch | Synonyms: impalpable |
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| (adjective) (of especially business assets) not having physical substance or intrinsic productive value | - |
| (adjective) lacking substance or reality; incapable of being touched or seen | Synonyms: nonphysical |
| (adjective) hard to pin down or identify | - |
| (noun) assets that are saleable though not material or physical | Synonyms: intangible asset |
| intangibleness | (noun) the quality of being intangible and not perceptible by touch | Synonyms: impalpability, intangibility |
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| intelligibility | (noun) the quality of language that is comprehensible | - |
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| intelligible | (adjective) well articulated or enunciated, and loud enough to be heard distinctly | - |
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| (adjective) capable of being apprehended or understood | Synonyms: apprehensible, graspable, perceivable, understandable |
| intelligibly | (adverb) in an intelligible manner | Synonyms: clearly, understandably |
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| intertribal | (adjective) between or among tribes | - |
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| invertible | (adjective) having an additive or multiplicative inverse | - |
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| invincibility | (noun) the property being difficult or impossible to defeat | Synonyms: indomitability |
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| invincible | (adjective) incapable of being overcome or subdued | Synonyms: unbeatable, unvanquishable |
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| invincibly | (adverb) in an invincible manner | - |
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| invisibility | (noun) the quality of not being perceivable by the eye | Synonyms: invisibleness |
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| invisible | (adjective) impossible or nearly impossible to see; imperceptible by the eye | Synonyms: unseeable |
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| (adjective) not prominent or readily noticeable | Synonyms: inconspicuous |
| invisibleness | (noun) the quality of not being perceivable by the eye | Synonyms: invisibility |
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| invisibly | (adverb) without being seen | - |
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| irascibility | (noun) a feeling of resentful anger | Synonyms: quick temper, short temper, spleen |
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| irascible | (adjective) characterized by anger | Synonyms: choleric |
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| (adjective) quickly aroused to anger | Synonyms: choleric, hot-tempered, hotheaded, quick-tempered, short-tempered |
| irreducible | (adjective) incapable of being made smaller or simpler | - |
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| irrepressibility | (noun) irrepressible liveliness and good spirit | Synonyms: buoyancy |
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| irrepressible | (adjective) impossible to repress or control | Synonyms: uncontrollable |
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| irreproducibility | (noun) the quality of being unreproducible | - |
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| irreproducible | (adjective) impossible to reproduce or duplicate | Synonyms: unreproducible |
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| irresistibility | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibleness |
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| irresistible | (adjective) impossible to resist; overpowering | Synonyms: resistless |
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| (adjective) overpoweringly attractive | - |
| irresistibleness | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibility |
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| irresistibly | (adverb) incapable of being resisted | Synonyms: overpoweringly, overwhelmingly |
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| irresponsibility | (noun) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions | Synonyms: irresponsibleness |
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| irresponsible | (adjective) showing lack of care for consequences | - |
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| irresponsibleness | (noun) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions | Synonyms: irresponsibility |
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| irresponsibly | (adverb) in an irresponsible manner | - |
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| irreversibility | (noun) the quality of being irreversible (once done it cannot be changed) | - |
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| irreversible | (adjective) incapable of being reversed | - |
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| irreversibly | (adverb) in an irreversible manner | - |
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| isoantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: alloantibody |
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| jib | (noun) any triangular fore-and-aft sail (set forward of the foremast) | - |
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| (verb) shift from one side of the ship to the other | Synonyms: change course, gybe, jibe |
| (verb) refuse to comply | Synonyms: balk, baulk, resist |
| jibboom | (noun) a spar that extends the bowsprit | - |
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| jibe | (noun) an aggressive remark directed at a person like a missile and intended to have a telling effect | Synonyms: barb, dig, gibe, shaft, shot, slam |
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| (verb) shift from one side of the ship to the other | Synonyms: change course, gybe, jib |
| (verb) be compatible, similar or consistent; coincide in their characteristics | Synonyms: agree, check, correspond, fit, gibe, match, tally |
| kibbitz | (verb) make unwanted and intrusive comments | Synonyms: kibitz |
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| kibble | (noun) an iron bucket used for hoisting in wells or mining | - |
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| (noun) coarsely ground grain in the form of pellets (as for pet food) | - |
| kibbutz | (noun) a collective farm or settlement owned by its members in modern Israel; children are reared collectively | - |
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| kibbutznik | (noun) a member of a kibbutz | - |
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| kibe | (noun) ulcerated chilblain on the heel | - |
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| kibibit | (noun) a unit of information equal to 1024 bits | Synonyms: kibit |
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| kibibyte | (noun) a unit of information equal to 1024 bytes | Synonyms: K, kB, KB, KiB, kilobyte |
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| kibit | (noun) a unit of information equal to 1024 bits | Synonyms: kibibit |
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| kibitz | (verb) make unwanted and intrusive comments | Synonyms: kibbitz |
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| kibitzer | (noun) (Yiddish) a meddler who offers unwanted advice to others | - |
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| kibosh | (verb) stop from happening or developing | Synonyms: block, halt, stop |
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| lamellibranch | (adjective) bivalve | Synonyms: pelecypod, pelecypodous |
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| (noun) marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together | Synonyms: bivalve, pelecypod |
| legibility | (noun) a quality of writing (print or handwriting) that can be easily read | Synonyms: readability |
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| (noun) distinctness that makes perception easy | Synonyms: discernability |
| legible | (adjective) (of handwriting, print, etc.) capable of being read or deciphered | - |
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| legibly | (adverb) in a legible manner | Synonyms: decipherably, readably |
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| libation | (noun) the act of pouring a liquid offering (especially wine) as a religious ceremony | - |
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| (noun) a serving (of wine) poured out in honor of a deity | - |
| (noun) (facetious) a serving of an alcoholic beverage | - |
| libber | (noun) a supporter of feminism | Synonyms: feminist, women's liberationist, women's rightist |
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| libel | (noun) a false and malicious publication printed for the purpose of defaming a living person | - |
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| (noun) the written statement of a plaintiff explaining the cause of action (the defamation) and any relief he seeks | - |
| (verb) print slanderous statements against | - |
| libeler | (noun) one who attacks the reputation of another by slander or libel | Synonyms: backbiter, defamer, maligner, slanderer, traducer, vilifier |
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| libellous | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumniatory, calumnious, defamatory, denigrating, denigrative, denigratory, libelous, slanderous |
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| libelous | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumniatory, calumnious, defamatory, denigrating, denigrative, denigratory, libellous, slanderous |
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| liberal | (adjective) tolerant of change; not bound by authoritarianism, orthodoxy, or tradition | - |
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| (adjective) showing or characterized by broad-mindedness | Synonyms: broad, large-minded, tolerant |
| (adjective) given or giving freely | Synonyms: big, bighearted, bounteous, bountiful, freehanded, giving, handsome, openhanded |
| (adjective) not literal | Synonyms: free, loose |
| (adjective) having political or social views favoring reform and progress | - |
| (noun) a person who favors a political philosophy of progress and reform and the protection of civil liberties | Synonyms: liberalist, progressive |
| (noun) a person who favors an economic theory of laissez-faire and self-regulating markets | - |