adj. frivolous and silly; featherbrained or scatterbrained
the GNU version of the Collaborative International Dictionary of English
adj. Wild; giddy; volatile; heedless.
The Century Dictionary and Cyclopedia
Having or indicating, as it were, no more brain than a hare; giddy; heedless; reckless; wild.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. very foolish
Word Usage
"A federal judge has denied what he called a "harebrained" motion by Rod Blagojevich's lawyers over what they claimed was potential misconduct by the jury forewoman at his retrial."