1. (adj) silly
a word used for misbehaving children
"don't be a silly"
2. (adj) cockamamie, cockamamy, goofy, sappy, silly, wacky, whacky, zany
ludicrous, foolish
"gave me a cockamamie reason for not going"; "wore a goofy hat"; "a silly idea"; "some wacky plan for selling more books"
3. (adj) airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly
lacking seriousness; given to frivolity
"a dizzy blonde"; "light-headed teenagers"; "silly giggles"
4. (adj) pathetic, ridiculous, silly
inspiring scornful pity
"how silly an ardent and unsuccessful wooer can be especially if he is getting on in years"- Dashiell Hammett
5. (adj) punch-drunk, silly, slaphappy
dazed from or as if from repeated blows
"knocked silly by the impact"; "slaphappy with exhaustion"
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Definition of 'silly' 
