Thesaurus entry: lunatic

lunatic noun  he drives like a lunatic synonyms : maniac, madman, madwoman, imbecile, psychopath, psychotic; fool, idiot; eccentric; informal loony, nut, nutcase, head case, psycho, moron, screwball, crackpot, fruitcake, loon.
adjective   1. a lunatic prisoner. See mad sense 1.
  2. a lunatic idea. See mad sense 3.

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