weak-minded or lacking good sense; stupid or foolish

a silly writer.

absurd; ridiculous; irrational

a silly idea.

stunned; dazed

He knocked me silly.

Cricket . (of a fielder or the fielder's playing position) extremely close to the batsman's wicket

silly mid off.

Archaic . rustic; plain; homely.

Archaic . weak; helpless.

Obsolete . lowly in rank or state; humble.

Informal . a silly or foolish person

Don't be such a silly.

noun

absurdity , folly , foolery , idiocy , imbecility , insanity , lunacy , madness , nonsense , preposterousness , senselessness , tomfoolery , zaniness , craziness , foolishness , goofiness , inaneness , inanity , ineptitude , puerility , stupidity