In a state of stupor; having the faculties deadened or dulled; stupefied, either permanently or temporarily; benumbed.Lacking ordinary activity of mind; dull in ideas or expression; slow-witted; obtuse; crass.Characterized by mental dullness or inanity; witless; senseless; foolish; inane: as, a stupid joke; a stupid book; stupid fears.Synonyms Heavy, dull, drowsy, lethargic, comatose, torpid.Muddy-brained, muddled.Silly, Foolish, etc. (see absurd); flat, tame, humdrum, pointless, prosaic. See list under foolish.n. A stupid or humdrum person; a blockhead; a dunce.