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Meaning of insane

in•sane

Pronunciation: (in-sān'), [key]
— adj.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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