| insobriety | (noun) a temporary state resulting from excessive consumption of alcohol | Synonyms: drunkenness, inebriation, inebriety, intoxication, tipsiness |
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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 |
| 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 |
| insolvency | (noun) the lack of financial resources | - |
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| insolvent | (noun) someone who has insufficient assets to cover their debts | Synonyms: bankrupt |
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| insomnia | (noun) an inability to sleep; chronic sleeplessness | - |
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| insomniac | (noun) someone who cannot sleep | Synonyms: sleepless person |
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| insouciance | (noun) the cheerful feeling you have when nothing is troubling you | Synonyms: carefreeness, lightheartedness, lightsomeness |
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