[n] a word used for misbehaving children; "don't be a silly"
[adj] (informal) dazed from or as if from repeated blows; "knocked silly by the impact"; "slaphappy with exhaustion"
[adj] inspiring scornful pity; "how silly an ardent and unsuccessful wooer can be especially if he is getting on in years"- Dashiell Hammett
[adj] lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles"
[adj] (informal terms) "gave me a cockamamie reason for not going"; "wore a goofy hat"; "a silly idea"; "some wacky plan for selling more books"
airheaded, cockamamie, cockamamy, confused, dizzy, empty-headed, featherbrained, fool(a), foolish, frivolous, giddy, goofy, lightheaded, light-headed, pathetic, punch-drunk, ridiculous, sappy, slaphappy, undignified, unreasonable, wacky, whacky, zany
child, fry, kid, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster