The noun silly has 1 sense (no senses from tagged texts)
1. silly -- (a word used for misbehaving children; "don't be a silly")
Overview of adj silly
The adj silly has 4 senses (first 2 from tagged texts)
1. (8) 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")
2. (1) airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly -- (lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles")
3. 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)
4. punch-drunk, silly, slaphappy -- (dazed from or as if from repeated blows; "knocked silly by the impact"; "slaphappy with exhaustion")