Dictionary definition · silly
noun
- a word used for misbehaving children"don't be a silly"
adjective
- ludicrous, foolish"wore a goofy hat"
- lacking seriousness; given to frivolity"a dizzy blonde"
- inspiring scornful pity"how silly an ardent and unsuccessful wooer can be especially if he is getting on in years"
- dazed from or as if from repeated blows"knocked silly by the impact"
Source: Open English WordNet (CC BY 4.0).