Definition of lunatic in English:


Line breaks: lu¦na|tic
Pronunciation: /ˈluːnətɪk



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  • 1Mentally ill (not in technical use): a ward of lunatic old ladies
    More example sentences
    • Do you remember that one episode of X-Files with that crazed lunatic writer who was in love with Scully?
    • The frustration is so great that the black character believes that he might wind up in a lunatic cell, driven crazy by the insane demands.
    • I said I found him, not that he was some insane lunatic murderer trying to kill me!
  • 1.1Extremely foolish or eccentric: he would be asked to acquiesce in some lunatic scheme
    More example sentences
    • What happens if you break all the rules and throw your reputation behind a lunatic scheme to let people hear world-class classical music for the price of a couple of pints?
    • They will presumably lead to some retraction of the lunatic version of markets that have been imposed by extreme reactionaries in recent years.
    • A small smile touched her lips, her eyes alight with a lunatic fire.


Middle English: from Old French lunatique, from late Latin lunaticus, from Latin luna 'moon' (from the belief that changes of the moon caused intermittent insanity).

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