Synonyms and Antonyms of non compos mentis
- will seek to prove that the elderly tycoon was non compos mentis when he dictated that will
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, maniacal (also maniac), mental, 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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