Synonyms For "Loony" :

1 syllable:

bats, cracked, daft, kookie, nuts

2 syllables:

balmy, barmy, batty, bonkers, buggy, crackers, crazy, dotty, fruity, kooky, loco, looney, loopy, nutcase, nutty, wacky, weirdo, whacky

3 syllables: