silly

1. adjective

1)

don't be so silly

Syn:

foolish, stupid, unintelligent, idiotic, brainless, mindless, witless, imbecilic, doltish; imprudent, thoughtless, rash, reckless, foolhardy, irresponsible; mad, scatterbrained, featherbrained; frivolous, giddy, inane, immature, childish, puerile, empty-headed; informal crazy, dotty, scatty, loopy, wingy, ditzy, screwy, thick, thickheaded, birdbrained, pea-brained, dopey, dim, dimwitted, halfwitted, dippy, blockheaded, boneheaded, lamebrained; daft, chowderheaded; dated tomfool

Ant:

sensible

2)

that was a silly thing to do

Syn:

unwise, imprudent, thoughtless, foolish, stupid, idiotic, senseless, mindless; rash, reckless, foolhardy, irresponsible, injudicious, misguided, irrational; informal crazy; daft

Ant:

sensible

3)

he would brood about silly things

Syn:

trivial, trifling, frivolous, footling, petty, small, insignificant, unimportant; informal piffling, piddling, small-bore

Ant:

important

4)

he drank himself silly

Syn:

senseless, insensible, unconscious, stupid, into a stupor, into senselessness, stupefied

2. noun, informal

you're such a silly!

See fool 1. 1)