Synonyms and Antonyms of crackbrained
- He had the crackbrained idea that he was receiving radio signals from outer space.
balmy, bats, batty, bedlam, bonkers, brainsick, certifiable, 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, 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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