harebrained [ adj ] very foolish <adj.all> harebrained ideastook insane risks behind the wheel a completely mad scheme to build a bridge between two mountains
Harebrained \Hare"brained`\ (h[^a]r"br[=a]nd`), a. Wild; giddy; volatile; heedless. ``A mad hare-brained fellow.'' --North (Plutarch). [Written also {hairbrained}.]