| insalubrious | (adjective) detrimental to health | Synonyms: unhealthful, unhealthy |
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| insalubriousness | (noun) the quality of being insalubrious and debilitating | Synonyms: insalubrity |
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| insalubrity | (noun) the quality of being insalubrious and debilitating | Synonyms: insalubriousness |
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| insane | (adjective) afflicted with or characteristic of mental derangement | - |
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| (adjective) very foolish | Synonyms: harebrained, mad |
| insanely | (adverb) in an insane manner | Synonyms: crazily, dementedly, madly |
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| (adverb) (used as intensives) excessively | Synonyms: deadly, deucedly, devilishly, madly |
| insaneness | (noun) obsolete terms for legal insanity | Synonyms: lunacy, madness |
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| insanitary | (adjective) not sanitary or healthful | Synonyms: unhealthful, unsanitary |
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| insanity | (noun) relatively permanent disorder of the mind | - |
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| insatiable | (adjective) impossible to satisfy | Synonyms: insatiate, unsatiable |
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| insatiably | (adverb) in an insatiable manner; with persistence but without satisfaction | Synonyms: unsatiably |
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| (adverb) to an insatiable degree | Synonyms: unsatiably |
| insatiate | (adjective) impossible to satisfy | Synonyms: insatiable, unsatiable |
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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 | - |
| inscription | (noun) the activity of inscribing (especially carving or engraving) letters or words | - |
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| (noun) letters inscribed (especially words engraved or carved) on something | Synonyms: lettering |
| (noun) a short message (as in a book or musical work or on a photograph) dedicating it to someone or something | Synonyms: dedication |
| inscriptive | (adjective) of or relating to an inscription | - |
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| inscriptively | (adverb) by means of an inscription | - |
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| inscrutability | (noun) the quality of being impossible to investigate | - |
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| inscrutable | (adjective) of an obscure nature | Synonyms: cryptic, cryptical, deep, mysterious, mystifying |
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| inscrutably | (adverb) in an inscrutable manner | - |
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| insect | (noun) small air-breathing arthropod | - |
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| (noun) a person who has a nasty or unethical character undeserving of respect | Synonyms: dirt ball, louse, worm |
| insectan | (adjective) of or relating to the class Insecta | - |
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| insecticidal | (adjective) of or relating to insecticide | - |
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| insecticidally | (adverb) by means of an insecticide | - |
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| insecticide | (noun) a chemical used to kill insects | Synonyms: insect powder |
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| insectifuge | (noun) a chemical substance that repels insects | Synonyms: insect repellant, insect repellent |
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| insectivore | (noun) small insect-eating mainly nocturnal terrestrial or fossorial mammals | - |
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| (noun) any organism that feeds mainly on insects | - |
| 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 |
| insecurely | (adverb) in a manner involving risk | - |
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| (adverb) in a tentative and self-conscious manner | - |
| insecureness | (noun) the state of being exposed to risk or anxiety | - |
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| insecurity | (noun) the anxiety you experience when you feel vulnerable and insecure | - |
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| (noun) the state of being subject to danger or injury | - |
| inseminate | (verb) introduce semen into (a female) | Synonyms: fecundate, fertilise, fertilize |
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| (verb) place seeds in or on (the ground) | Synonyms: sow, sow in |
| insemination | (noun) the introduction of semen into the genital tract of a female | - |
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| (noun) the act of sowing (of seeds in the ground or, figuratively, of germs in the body or ideas in the mind, etc.) | - |
| 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 |
| insensately | (adverb) in an insensate manner | - |
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| 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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| insensitive | (adjective) not responsive to physical stimuli | - |
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| (adjective) deficient in human sensibility; not mentally or morally sensitive | - |
| insensitively | (adverb) in an insensitive manner | - |
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| insensitiveness | (noun) the inability to respond to affective changes in your interpersonal environment | Synonyms: insensitivity |
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| insensitivity | (noun) the inability to respond to affective changes in your interpersonal environment | Synonyms: insensitiveness |
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| insentience | (noun) lacking consciousness or ability to perceive sensations | - |
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| 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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| inseparably | (adverb) without possibility of separation | - |
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| insert | (noun) (film) a still picture that is introduced and that interrupts the action of a film | Synonyms: cut-in |
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| (noun) (broadcasting) a local announcement inserted into a network program | Synonyms: cut-in |
| (noun) an artifact that is inserted or is to be inserted | Synonyms: inset |
| (noun) a folded section placed between the leaves of another publication | - |
| (verb) place, fit, or thrust (something) into another thing | Synonyms: enclose, inclose, introduce, put in, stick in |
| (verb) insert casually | Synonyms: slip in, sneak in, stick in |
| (verb) put or introduce into something | Synonyms: enter, infix, introduce |
| (verb) fit snugly into | Synonyms: tuck |
| insertion | (noun) the act of putting one thing into another | Synonyms: introduction, intromission |
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| (noun) a message (spoken or written) that is introduced or inserted | Synonyms: interpolation |
| inset | (noun) a piece of material used to strengthen or enlarge a garment | Synonyms: gusset |
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| (noun) an artifact that is inserted or is to be inserted | Synonyms: insert |
| (noun) a small picture inserted within the bounds or a larger one | - |
| (verb) set or place in | - |
| inshore | (adjective) (of winds) coming from the sea toward the land | Synonyms: onshore, shoreward |
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| (adjective) close to a shore | - |
| (adverb) toward the 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 | - |
| (noun) the inner or enclosed surface of something | Synonyms: interior |
| (noun) the region that is inside of something | Synonyms: interior |
| (adverb) within a building | Synonyms: indoors |
| (adverb) on the inside | Synonyms: within |
| (adverb) in reality | Synonyms: at bottom, at heart, deep down, in spite of appearance |
| (adverb) with respect to private feelings | Synonyms: inwardly |
| insider | (noun) an officer of a corporation or others who have access to private information about the corporation's operations | - |
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| insides | (noun) internal organs collectively (especially those in the abdominal cavity) | Synonyms: entrails, innards, viscera |
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| 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 | - |
| insidiously | (adverb) in a harmfully insidious manner | Synonyms: perniciously |
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| insidiousness | (noun) subtle and cumulative harmfulness (especially of a disease) | - |
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| (noun) the quality of being designed to entrap | - |
| insight | (noun) grasping the inner nature of things intuitively | Synonyms: sixth sense |
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| (noun) the clear (and often sudden) understanding of a complex situation | Synonyms: brainstorm, brainwave |
| (noun) clear or deep perception of a situation | Synonyms: penetration |
| (noun) a feeling of understanding | Synonyms: perceptiveness, perceptivity |
| insightful | (adjective) exhibiting insight or clear and deep perception | - |
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| insightfulness | (noun) shrewdness shown by keen insight | Synonyms: acumen |
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| insignia | (noun) a badge worn to show official position | - |
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| insignificance | (noun) the quality of having little or no significance | - |
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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 |
| insignificantly | (adverb) not to a significant degree or amount | - |
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| (adverb) in an insignificant manner | - |
| insincere | (adjective) lacking sincerity | - |
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| insincerely | (adverb) without sincerity | - |
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| insincerity | (noun) the quality of not being open or truthful; deceitful or hypocritical | Synonyms: falseness, hollowness |
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| insinuate | (verb) give to understand | Synonyms: adumbrate, intimate |
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| (verb) introduce or insert (oneself) in a subtle manner | - |
| insinuating | (adjective) calculated to please or gain favor | Synonyms: ingratiating, ingratiatory |
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| insinuatingly | (adverb) in an insinuating manner | - |
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| insinuation | (noun) the act of gaining acceptance or affection for yourself by persuasive and subtle blandishments | Synonyms: ingratiation |
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| (noun) an indirect (and usually malicious) implication | Synonyms: innuendo |
| 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 |
| insipidity | (noun) lacking any distinctive or interesting taste property | Synonyms: blandness, insipidness |
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| (noun) extreme dullness; lacking spirit or interest | Synonyms: boringness, dreariness, insipidness |
| insipidly | (adverb) in an insipid manner | - |
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| insipidness | (noun) lacking any distinctive or interesting taste property | Synonyms: blandness, insipidity |
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| (noun) extreme dullness; lacking spirit or interest | Synonyms: boringness, dreariness, insipidity |
| insist | (verb) postulate positively and assertively | Synonyms: assert |
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| (verb) be emphatic or resolute and refuse to budge | Synonyms: take a firm stand |
| (verb) beg persistently and urgently | Synonyms: importune |
| insistence | (noun) the act of insisting on something | Synonyms: insistency |
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| (noun) continual and persistent demands | Synonyms: insisting |
| (noun) the state of demanding notice or attention | Synonyms: imperativeness, insistency, press, pressure |
| insistency | (noun) the act of insisting on something | Synonyms: insistence |
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| (noun) the state of demanding notice or attention | Synonyms: imperativeness, insistence, press, pressure |
| insistent | (adjective) repetitive and persistent | Synonyms: repetitive |
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| (adjective) demanding attention | Synonyms: clamant, crying, exigent, instant |
| insistently | (adverb) in an insistent manner | - |
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| insisting | (noun) continual and persistent demands | Synonyms: insistence |
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| insobriety | (noun) a temporary state resulting from excessive consumption of alcohol | Synonyms: drunkenness, inebriation, inebriety, intoxication, tipsiness |
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| insofar | (adverb) to the degree or extent that | Synonyms: in so far, so far, to that degree, to that extent |
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| insolate | (verb) expose to the rays of the sun or affect by exposure to the sun | Synonyms: solarise, solarize, sun |
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| insolation | (noun) therapeutic exposure to sunlight | Synonyms: heliotherapy |
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| (noun) incident solar radiation | - |
| (noun) sudden prostration due to exposure to the sun or excessive heat | Synonyms: siriasis, sunstroke, thermic fever |
| insole | (noun) the inner sole of a shoe or boot where the foot rests | Synonyms: innersole |
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| insolence | (noun) an offensive disrespectful impudent act | - |
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| (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, gall, impertinence, impudence |
| 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 |
| insolently | (adverb) in an insolent manner | - |
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| insolubility | (noun) the quality of being insoluble and difficult to dissolve in liquid | - |
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| (noun) the property (of a problem or difficulty) that makes it impossible to solve | Synonyms: unsolvability |
| 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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| insolvency | (noun) the lack of financial resources | - |
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| insolvent | (adjective) unable to meet or discharge financial obligations | - |
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| (noun) someone who has insufficient assets to cover their debts | Synonyms: bankrupt |
| insomnia | (noun) an inability to sleep; chronic sleeplessness | - |
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| insomniac | (adjective) experiencing or accompanied by sleeplessness | Synonyms: sleepless, watchful |
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| (noun) someone who cannot sleep | Synonyms: sleepless person |
| insomuch | (adverb) to such an extent or degree; so | - |
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| insouciance | (noun) the cheerful feeling you have when nothing is troubling you | Synonyms: carefreeness, lightheartedness, lightsomeness |
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| insouciant | (adjective) marked by blithe unconcern | Synonyms: casual, nonchalant |
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| inspan | (verb) attach a yoke or harness to | - |
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| inspect | (verb) examine carefully for accuracy with the intent of verification | Synonyms: audit, scrutinise, scrutinize |
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| (verb) come to see in an official or professional capacity | Synonyms: visit |
| (verb) look over carefully | - |