in·sane /ɪnˈseɪn/ Pronunciation Key - Show Spelled Pronunciation[in-seyn] Pronunciation Key –adjective
1. not sane; not of sound mind; mentally deranged.
2. of, pertaining to, or characteristic of a person who is mentally deranged: insane actions; an insane asylum.
3. utterly senseless: an insane plan.

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Jami