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Definition of maniac:

  1. A raving lunatic; a madman.
  2. Of or pertaining to, or suitable for, an insane person; evincing lunacy; as, lunatic gibberish; a lunatic asylum.
  3. Raving with madness; raging with disordered intellect; affected with mania; mad.

Synonyms:

harum-scarum, fan, insane, fanatic, zealot, daredevil, hothead, concern, enthusiast, freak, bug, maniacal, devotee, madcap, swashbuckler, buff.

Usage examples: