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insane

[ in-seyn ]
/ ɪnˈseɪn /
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See synonyms for: insane / insanely / insaneness on Thesaurus.com

adjective
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Origin of insane

First recorded in 1550–60; from Latin insānus “unsound (of mind), demented, frenzied”; see origin at in-3, sane

synonym study for insane

5. See mad.

OTHER WORDS FROM insane

in·sane·ly, adverbin·sane·ness, nounpseu·do·in·sane, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use insane in a sentence

British Dictionary definitions for insane

insane
/ (ɪnˈseɪn) /

adjective
  1. mentally deranged; crazy; of unsound mind
  2. (as collective noun; preceded by the)the insane
characteristic of a person of unsound mindan insane stare
irresponsible; very foolish; stupid

Derived forms of insane

insanely, adverbinsaneness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for insane

insane
[ ĭn-sān ]

adj.
Of, exhibiting, or afflicted with insanity.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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