Maniacal | Definition of maniacal by Merriam-Webster

Definition of MANIACAL

1

: affected with or suggestive of madness <maniacal laughter>

2

: characterized by ungovernable excitement or frenzy : frantic <a maniacal mob>

— ma·ni·a·cal·ly \mə-ˈnī-ə-k(ə-)lē\ adverb

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ma·ni·a·cal also ma·ni·ac \ˈmā-nē-ˌak\

1526

Synonyms: balmy, barmy [chiefly British], bats, batty, bedlam, bonkers, brainsick, bughouse [slang], certifiable, crackbrained, cracked, crackers, crackpot, cranky [dialect], crazed, crazy, cuckoo, daffy, daft, demented, deranged, fruity [slang], gaga, haywire, kooky (also kookie), loco [slang], loony (also looney), loony tunes (or looney tunes), lunatic, mad, insane (also maniac), mental, meshuga (or meshugge also meshugah or meshuggah), moonstruck, non compos mentis, nuts, nutty, psycho, psychotic, scatty [chiefly British], screwy, unbalanced, unhinged, unsound, wacko (also whacko), wacky (also whacky), wud [chiefly Scottish]

: affected with or exhibiting insanity : mad, insane <a maniacal killer>

—ma·ni·a·cal·ly \mə-ˈnī-ə-k(ə-)lē\ adverb

ma·ni·a·cal also ma·ni·ac \ˈmā-nē-ak\

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