harebrained

(hâr'brānd')
adj.
Foolish; flighty: a harebrained scheme.

USAGE NOTE   The first use of harebrained dates to 1548. The spelling hairbrained also has a long history, going back to the 1500s when hair was a variant spelling of hare. The hair variant was preserved in Scotland into the 18th century, and as a result it is impossible to tell exactly when people began writing hairbrained in the belief that the word means "having a hair-sized brain" rather than "with no more sense than a hare." While hairbrained continues to be used and confused, it should be avoided in favor of harebrained which has been established as the correct spelling.

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adjective

1. 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/inability, knowledge/ignorance.
2. Given to lighthearted silliness: empty-headed, featherbrained, flighty, frivolous, frothy, giddy, lighthearted, scatterbrained, silly. Informal gaga. Slang birdbrained, dizzy. See ability/inability.

adj

Definition: stupid, unthinking
Antonyms: brainy, intelligent, reasonable, sensible, smart, thoughtful

For a list of words related to harebrained, see:

• Foolish, Immature, Bigoted, or Trivial

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See words rhyming with "harebrained."

Dansk (Danish)
adj. - ubesindig, tankeløs, forfløjen

Nederlands (Dutch)
met weinig verstand, dom, onzinnig

Français (French)
adj. - farfelu, écervelé

Deutsch (German)
adj. - unüberlegt

Ελληνική (Greek)
adj. - κοκορόμυαλος

Italiano (Italian)
sventato

Português (Portuguese)
adj. - descuidado

Русский (Russian)
опрометчивый, глупый

Español (Spanish)
adj. - casquivano

Svenska (Swedish)
adj. - tanklös, snurrig

中文（简体）(Chinese (Simplified))
轻率的, 粗心的, 欠考虑的

中文（繁體）(Chinese (Traditional))
adj. - 輕率的, 粗心的, 欠考慮的

한국어 (Korean)
adj. - 변덕스러운, 들뜬, 엉뚱한, 경망한

日本語 (Japanese)
adj. - 軽率な

العربيه (Arabic)
‏(صفه) طائش, ارعن, خفيف العقل‏

עברית (Hebrew)
adj. - ‮טיפשי, פזיז, פראי‬

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