Thesaurus

Synonyms for Silly include:

absurd, addlebrained, addled, addlepated, airheaded, asinine, befogged, befuddled, clouded, cockamamie, cockamamy, cockeyed, confused, dazed, dazzled, demeaning, derisory, discomposed, dizzy, empty-headed, fatuous, featherbrained, flighty, flippant, flyaway, fond, foolish, frivolous, giddy, goofy, harebrained, head-in-the-clouds, humbling, humiliating, idiotic, idle, ill-advised, ill-conceived, impolitic, imprudent, inadvisable, inane, inelegant, infra dig, insane, laughable, light, light-headed, light-minded, lightheaded, ludicrous, mad, mindless, misguided, mortifying, muddled, muddleheaded, muzzy, nonsensical, pathetic, perplexed, potty, preposterous, puddingheaded, punch-drunk, rattlebrained, rattlepated, ridiculous, sappy, scatterbrained, scatty, silly, slaphappy, spaced-out, stunned, stupefied, stupid, superficial, trancelike, trivial, unadvisable, unadvised, undignified, unwise, vacuous, wacky, whacky, woolly, woolly-headed, wooly, wooly-minded, zany

silly is a ADJ.