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• someone deranged and possibly dangerous

  synonym	looneyloonynutcaseweirdo
  exemplifies	colloquialismdepreciationderogationdisparagement
  hypernym	lunaticmaniac

• intensely enthusiastic about or preoccupied with

  synonym	dottygagawild
  derivation	crazecraziness
  exemplifies	colloquialism
  similar	enthusiastic

• possessed by inordinate excitement

  derivation	craziness
  exemplifies	colloquialism
  similar	excited

• foolish; totally unsound

  synonym	half-bakedscrewballsoftheaded
  derivation	craziness
  exemplifies	colloquialism
  similar	impractical

• affected with madness or insanity

  synonym	brainsickdementeddisturbedmadsickunbalancedunhinged
  derivation	crazecraziness
  similar	insane

• bizarre or fantastic

  similar

  strangeunusual