tu·pid [stoo-pid, styoo‑] Pronunciation Key – Show IPA Pronunciation adjective, -er, -est, noun
||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.
Thanks to dictionary.com for making that clear, but I think defining stupid is a lot like defining pornography.
“I know it when I see it”