Synonyms and Antonyms of silly
- the matinee show was filled with a bunch of silly children making noise
birdbrained, ditzy (or ditsy), dizzy, featherbrained, flighty, frivolous, frothy, futile, giddy, goofy, harebrained, light-headed, light-minded, puerile, scatterbrained, yeasty
grave, melancholy, somber (or sombre), thoughtful
dignified, heavy, no-nonsense, sedate, severe, solemn, staid
- those silly movie producers who thought that audiences would fall for that gimmick all over again
absurd, asinine, balmy, brainless, bubbleheaded, cockeyed, crackpot, crazy, cuckoo, daffy, daft, dippy, dotty, fatuous, featherheaded, fool, foolish, half-baked, half-witted, harebrained, inept, insane, jerky, kooky (also kookie), loony (also looney), lunatic, lunkheaded, mad, nonsensical, nutty, preposterous, sappy, screwball, senseless, simpleminded, stupid, tomfool, unwise, wacky (also whacky), weak-minded, witless, zany
airheaded, birdbrained, boobish, brain-dead, chowderheaded, chuckleheaded, clueless, dense, dim, dim-witted, doltish, dopey (also dopy), dorky [slang], dull, dumb, dunderheaded, empty-headed, fatuous, feebleminded, gormless [chiefly British], idiotic (also idiotical), imbecile (or imbecilic), knuckleheaded, lamebrain (or lamebrained), mindless, moronic, oafish, obtuse, opaque, pinheaded, simple, slow, slow-witted, soft, softheaded, thoughtless, thick, thickheaded, unintelligent, vacuous, witless
fallacious, illogical, invalid, irrational, nonrational, surd, unreasonable, unreasoning, unsound, weak