See harebrained in Webster's New World Roget's A-Z Thesaurus II
adjective
So senseless as to be laughable:
absurd, foolish, idiotic, imbecilic, insane, lunatic, mad, moronic, nonsensical, preposterous, silly, softheaded, tomfool, unearthly, zany. (Informal) cockeyed, crazy, loony, loopy. (Slang) balmy2, dippy, dopey, jerky, sappy, wacky. See ability, knowledgeGiven to lighthearted silliness:
empty-headed, featherbrained, flighty, frivolous, frothy, giddy, lighthearted, scatterbrained, silly. (Informal) gaga. (Slang) birdbrained, dizzy. See ability
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