| 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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