Originally Posted by any dictionary

stu⋅pid   [stoo-pid, styoo‑] Show IPA Pronunciation
adjective, -er, -est, noun
–adjective
1. lacking ordinary quickness and keenness of mind; dull.
2. characterized by or proceeding from mental dullness; foolish; senseless: a stupid question.
3. tediously dull, esp. due to lack of meaning or sense; inane; pointless: a stupid party.
4. annoying or irritating; troublesome: Turn off that stupid radio.
5. in a state of stupor; stupefied: stupid from fatigue.
6. Slang. excellent; terrific.
–noun
7. Informal. a stupid person.