Synonyms for Silly:
absurd, anachronistic, bizarre, contradictory, crazy, eccentric, fallacious, farcical, foolish, goofy, idiotic, illogical, implausible, impossible, inane, incongruous, inconsistent, invalid, irrational, laughable, ludicrous, meaningless, nonsensical, outlandish, paradoxical, preposterous, ridiculous, self-contradictory, senseless.
•absurd, giddy, foolish (adjective)
asinine, brainless, childish, crazy, dizzy, empty-headed, fatuous, featherbrained, flighty, frivolous, harebrained, idiotic, illogical, inane, inconsistent, irrational, ludicrous, meaningless, nonsensical, preposterous, puerile, ridiculous, senseless, unintelligent, unreasonable, vacuous, witless, dippy, simpleminded.
zany, cockamamy, imbecilic, tomfool, dippy.
comical, curious, dubious, grotesque, incredible, laughable, oddball, outrageous, poppycock, weird, absurd, bizarre, crazy, eccentric, farcical, foolish, ludicrous, nonsensical, outlandish, preposterous, ridiculous.
asinine, brainless, fatuous, harebrained, muddleheaded, puerile, shallow, trivial, vacuous, dippy, simpleminded, birdbrained, ditzy, air-headed.
inconsequential, irrelevant, mere, minor, petty, superficial, unconsidered, unimportant, of no consequence/of little consequence.
n.annoying, exasperating, frustrating, infuriating, irritating, maddening, obscene, unbearable, vexing. ability, brainless, childish, fatuous, insensate, mindless, over-the-top, planned, unintelligent, witless, Weak-minded, not in your right mind/not right in the head. dopey, harebrained, imbecilic, insane, jerky, knowledge, lunatic, mad, moronic, simple-minded, slow, slow-witted, softheaded, thick, tomfool, unearthly, dippy. bang, big, birdie, boo-boo, bow-wow, bunny, choo-choo, cold, cross, flighty, frothy, gaga, lighthearted, scatterbrained, birdbrained. innuendo, joke, one-liner, pun, punch line, wisecrack, witticism, wordplay, a play on words. •fool (noun)
airheaded, cockamamie, cockamamy, confused, dizzy, empty-headed, featherbrained, fool, foolish, frivolous, giddy, goofy, light-headed, lightheaded, pathetic, punch-drunk, ridiculous, sappy, slaphappy, undignified, unreasonable, wacky, whacky, zany.
brainless, fatuous, gaga, jerky, over-the-top, simple-minded, slow-witted, softheaded, witless, dippy, birdbrained. childish, harebrained, mindless, moronic, scatterbrained, shallow, unintelligent, Weak-minded. dopey, lunatic. frothy, insane, insensate, lighthearted, unearthly. mad. slow. thick. •giddy
•Other relevant words:
ability, airheaded, annoying, asinine, bang, big, birdie, boo-boo, bow-wow, brainless, bunny, childish, choo-choo, cockamamie, cockamamy, cold, confused, cross, dizzy, dopey, empty-headed, exasperating, fatuous, featherbrained, flighty, fool, frivolous, frothy, frustrating, gaga, giddy, goofy, harebrained, imbecilic, inconsequential, infuriating, innuendo, insane, insensate, irrelevant, irritating, jerky, joke, knowledge, light-headed, lightheaded, lighthearted, lunatic, mad, maddening, mere, mindless, minor, moronic, muddleheaded, obscene, one-liner, over-the-top, pathetic, petty, planned, puerile, pun, punch-drunk, sappy, scatterbrained, shallow, simple-minded, slaphappy, slow, slow-witted, softheaded, superficial, thick, tomfool, trivial, unbearable, unconsidered, undignified, unearthly, unimportant, unintelligent, unreasonable, vacuous, vexing, wacky, whacky, wisecrack, witless, witticism, wordplay, zany, Weak-minded, dippy, simpleminded, birdbrained, ditzy.