WordReference Random House Learner's Dictionary of American English © 2017
in•sane /ɪnˈseɪn/USA pronunciation   adj. 
  1. Psychiatry[not in technical use] mentally unsound; mad.
  2. of or characteristic of the mentally deranged:insane actions.
  3. utterly senseless;
    irrational;
    foolish:You're insane if you think you can jump off that bridge and live.
in•sane•ly, adv. 
in•sane•ness, n. [uncountable]
in•san•i•ty /ɪnˈsænɪti/USA pronunciation  n. [uncountable]See -san-.

WordReference Random House Unabridged Dictionary of American English © 2017
in•sane  (in sān),USA pronunciation 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.
in•sanely, adv. 
in•saneness, n. 
  • Latin insānus. See in-3, sane
  • 1550–60
    • 1.See corresponding entry in Unabridged demented;
      lunatic, crazed, crazy;
      maniacal.
    • 3.See corresponding entry in Unabridged foolish, irrational. See  mad. 


Collins Concise English Dictionary © HarperCollins Publishers::

insane /ɪnˈseɪn/ adj
  1. mentally deranged; crazy; of unsound mind
  2. (as collective noun; preceded by the): the insane
  3. characteristic of a person of unsound mind: an insane stare
  4. irresponsible; very foolish; stupid

inˈsanely adv inˈsaneness n



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