Lunatic Definition

lo͝onə-tĭk
lunatics
noun
lunatics
A person who is affected by lunacy; a mentally deranged person.
American Heritage
A very foolish person.
American Heritage
Antonyms:
  • sane
  • sane person
adjective
Suffering from lunacy; insane.
Webster's New World
Of or characterized by lunacy.
Webster's New World
Of or for people who are mentally deranged.
American Heritage
Of or for insane persons.
Webster's New World
Utterly foolish.
Webster's New World
Antonyms:

Other Word Forms of Lunatic

Noun

Singular:
lunatic
Plural:
lunatics

Origin of Lunatic

  • Middle English lunatik from Old French lunatique from Latin lūnāticus from lūna moon (from the belief that madness was influenced by the phases of the moon) leuk- in Indo-European roots

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

  • From Old French lunatique, from Late Latin lunaticus ("moonstruck"), derived from Latin luna ("moon").

    From Wiktionary

Lunatic Is Also Mentioned In

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lunatic