—adj. 1. weak-minded or lacking good sense; stupid or foolish: a silly writer. 2. absurd; ridiculous; irrational: a silly idea. 3. stunned; dazed: He knocked me silly. 4. Cricket.(of a fielder or the fielder's playing position) extremely close to the batsman's wicket: silly mid off. 5. Archaic.rustic; plain; homely.
6. Archaic.weak; helpless.
7. Obs.lowly in rank or state; humble.
—n. Informal.a silly or foolish person: Don't be such a silly.