rash, foolish, or badly thought out
WordReference Random House Learner's Dictionary of American English © 2025
hare•brained /ˈhɛrˌbreɪnd/USA pronunciation
adj.
WordReference Random House Unabridged Dictionary of American English © 2025- silly;
stupid;
foolish:a harebrained scheme.
hare•brained
(hâr′brānd′),USA pronunciation adj.
hare′brained′ly, adv.
hare′brained′ness, n.
- giddy;
reckless.
- hare + brained 1545–55
hare′brained′ness, n.
- rattlebrained, scatterbrained, half-baked, dimwitted.
Collins Concise English Dictionary © HarperCollins Publishers::
'harebrained' also found in these entries (note: many are not synonyms or translations):