Insane Definition

ĭn-sān
adjective
Of, exhibiting, or afflicted with mental derangement. Not used in psychiatric diagnosis.
American Heritage
Not sane; mentally ill or deranged; demented; mad.
Webster's New World
Of or for insane people.
An insane asylum.
Webster's New World
Intended for use by such persons.
An insane asylum.
American Heritage
Having been determined to be in a condition that meets the legal definition of insanity.
American Heritage

Origin of Insane

  • From Latin īnsānus (“unsound in mind; mad, insane”), from in- + sānus (“sound, sane”).

    From Wiktionary

  • Latin īnsānus in- not in–1 sānus sane, healthy

    From American Heritage Dictionary of the English Language, 5th Edition

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