adj. Informal., -fi·er, -fi·est.

1. Silly; foolish.
2. Crazy.

[From obsolete daff, fool, from Middle English daffe; probably akin to dafte, foolish. See daft.]

daffily daf'fi·ly adv.
daffiness daf'fi·ness n.

adjective

Afflicted with or exhibiting irrationality and mental unsoundness: brainsick, crazy, daft, demented, disordered, distraught, dotty, insane, lunatic, mad, maniac, maniacal, mentally ill, moonstruck, off, touched, unbalanced, unsound, wrong. Informal bonkers, cracked, gaga, loony. Slang bananas, batty, buggy, cuckoo, fruity, loco, nuts, nutty, screwy, wacky. Chiefly British crackers. Law non compos mentis. Idioms: around the bend, crazy as a loon, mad as a hatter, not all there, nutty as a fruitcake, offout ofone's head, off one's rocker, of unsound mind, out of one's mind, sick in the head, stark raving mad. See sane/insane.

Dansk (Danish)
adj. - fjoget, skør

Nederlands (Dutch)
dwaas/dom, stapel(gek), (gele) narcis

Français (French)
adj. - farfelu

Deutsch (German)
adj. - (ugs.) blöd

Ελληνική (Greek)
adj. - (καθομ.) παλαβός, κουτεντές

Italiano (Italian)
scemo

Português (Portuguese)
adj. - amalucado (m)

Русский (Russian)
шизонутый, глупый

Español (Spanish)
adj. - chiflado

Svenska (Swedish)
adj. - galen, dum

中文（简体） (Chinese (Simplified))
愚笨的, 疯狂的

中文（繁體） (Chinese (Traditional))
adj. - 愚笨的, 瘋狂的

한국어 (Korean)
adj. - 미친듯한, 바보 같은

日本語 (Japanese)
adj. - ばかな, 気の狂った

العربيه (Arabic)
‏(صفه) مجنون, أحمق‏

עברית (Hebrew)
adj. - ‮טיפשי‬

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Daffy Swimwear	daffy duck