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Adjective maniac has 1 sense
  1. maniacal, maniac - wildly disordered; "a maniacal frenzy"
    Antonym: sane (indirect, via insane)
,Noun maniac has 1 sense
  1. lunatic, madman, maniac - an insane person
    --1 is a kind of sick person, diseased person, sufferer
    --1 has particulars:
     crazy, loony, looney, weirdo; bedlamite; pyromaniac; madwoman
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