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[in-seyn] /ɪnˈseɪn/

not sane; not of sound mind; mentally deranged.
of, relating to, or characteristic of a person who is mentally deranged:
insane actions; an insane asylum.
utterly senseless:
an insane plan.

characteristic of a person of unsound mind: an insane stare
irresponsible; very foolish; stupid

1550s, from Latin insanus “mad, insane; outrageous, excessive, extravagant,” from in- “not” (see in- (1)) + sanus “well, healthy, sane” (see sane). Originally only of persons; of actions, from 1842. Cf. lunatic; and Italian pazzo “insane,” originally a euphemism, from Latin patiens “suffering.” German verrückt, literally past participle of verrücken “to displace,” “applied to the brain as to a clock that is ‘out of order’ ” [Buck]. The noun meaning “insane person” is attested from 1786.

insane in·sane (ĭn-sān’)
Of, exhibiting, or afflicted with insanity.


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  • Insanitation

    [in-san-i-tey-shuh n] /ɪnˌsæn ɪˈteɪ ʃən/ noun 1. lack of or sanitary regulation; unclean or unhealthy condition.

  • Insanity

    [in-san-i-tee] /ɪnˈsæn ɪ ti/ noun, plural insanities. 1. the condition of being ; a derangement of the mind. Synonyms: dementia, lunacy, madness, craziness, mania, aberration. 2. Law. such unsoundness of mind as frees one from legal responsibility, as for committing a crime, or as signals one’s lack of legal capacity, as for entering into a […]

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