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The Collaborative International Dictionary
hairbrained

Harebrained \Hare"brained`\ (h[^a]r"br[=a]nd`), a. Wild; giddy; volatile; heedless. ``A mad hare-brained fellow.''
--North (Plutarch). [Written also hairbrained.]

Wiktionary
hairbrained

a. (alternative spelling of harebrained English)

Usage examples of "hairbrained".

The buildings were made of native stone and enormous logs in an utterly bizarre architectural plan, like one of those hairbrained plans that artists think up for the magazines when they are handed a story of a visit to Mars or some other planet to illustrate.