lacking ordinary quickness and keenness of mind; dull.

characterized by or proceeding from mental dullness; foolish; senseless

a stupid question.

tediously dull, esp. due to lack of meaning or sense; inane; pointless

a stupid party.

annoying or irritating; troublesome

Turn off that stupid radio.

in a state of stupor; stupefied

stupid from fatigue.

Slang . excellent; terrific.

Informal . a stupid person.

adjective

cognizant , intelligent , responsible , smart , apt , exciting , interesting , lively , sharp , shrewd , spirited

adjective

brainless , dazed , deficient , dense , dim , doltish , dopey * , dull , dumb , dummy * , foolish , futile , gullible , half-baked * , half-witted * , idiotic , ill-advised , imbecilic , inane , indiscreet , insensate , irrelevant , laughable , loser * , ludicrous , meaningless , mindless , moronic , naive , nonsensical , obtuse , out to lunch , pointless , puerile , rash , senseless , shortsighted , simple , simpleminded , slow , sluggish , stolid , stupefied , thick , thick-headed , trivial , unintelligent , unthinking , witlessnotes:stupid refers to lack of ability while ignorant refers to lack of knowledge , hebetudinous , stuporous , torpid , blockheaded , thickheaded , thick-witted , absurd , addled , anserine , asinine , beef-witted , beetle-headed , besotted , blockish , bovine , brutish , clod , cloddish , comatose , crass , cretinous , dimwitted , dizzy , dopey , dumbbell , dunce , fat-witted , fatuous , footless , foppish , hebetate , humdrum , idiot , ignorant , imbecile , imperceptive , inept , insensible , irrational , irresponsible , lethargic , loutish , moron , oafish , oscitant , prosaic , prosy , purblind , silly , simpleton , stultifying , undiscerning , uninspiring tame , unwise , vacuous , vapid , witless , worthless