Definition of loony:
buggy, sappy, barmy, fruity, zany, soft, nutty, nuts, wild, around the bend, lunatic, chapped, dippy, off, crazy, awry, nutlike, brainsick, round the bend, insane, bonkers, zesty, amiss, whacky, zestful, demented, crank, touched, unearthly, screwy, harebrained, silly, wrong, alligatored, ability, mentally ill, batty, haywire, crackers, distraught, sane, nutcase, mild, kookie, dotty, cockamamie, knowledge, wise, roughened, screwball, gaga, daft, daffy, eccentric, nut, ding-a-ling, maniacal, looney, kook, bats, balmy, weirdo, non compos mentis, tomfool, loon, kooky, cuckoo, creep, preposterous, loco, cockeyed, weirdy, mad, softheaded, spook, moonstruck, dingbat, yeasty, unsound, cracked, unbalanced, loopy, weirdie, disordered, jerky, wacky, maniac, cockamamy, bananas.
foolish (part of speech: adjective)
- "The Everlasting Whisper", Jackson Gregory.
- "Patty's Social Season", Carolyn Wells.
With an air of offended dignity she stalked toward the door, but turned ere she had gone ten steps and continued, addressing the assembled company collectively: As fer bein' loony, I can tell you this.- "The Panchronicon", Harold Steele Mackaye.