Synonyms for loony

or looney also luny
adjective

(Informal)
So senseless as to be laughable:
absurd, foolish, harebrained, idiotic, imbecilic, insane, lunatic, mad, moronic, nonsensical, preposterous, silly, softheaded, tomfool, unearthly, zany. (Informal) cockeyed, crazy, loopy. (Slang) balmy², dippy, dopey, jerky, sappy, wacky. See ability, knowledge
(Informal)
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, daffy, gaga. (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, off (or out of) one's head, off one's rocker, of unsound mind, out of one's mind, sick in the head, stark raving mad. See sane

noun

(Informal)

A person regarded as strange, eccentric, or crazy:

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