Definition of maniacal
- maniacal laughter
- maniacal energy
- a maniacal killer
the movie's villain was a just a clichéd axe-wielding nutcase with a maniacal laugh
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'maniacal.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
balmy, bats, batty, bedlam, bonkers, brainsick, certifiable, crackbrained, cracked, crackpot, crazed, crazy, cuckoo, daffy, daft, demented, deranged, gaga, insane, kooky (also kookie), loco [slang], loony (also looney), lunatic, mad, mental, non compos mentis, nuts, nutty, psychotic, screwy, unbalanced, unhinged, unsound, wacky (also whacky);
around the bend, off one's gourd, off one's head, off one's rocker, out of one's head (or mind);
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