- lacking ordinary quickness and keenness of mind; dull.
- characterized by or proceeding from mental dullness; foolish; senseless: a stupid question.
- tediously dull, especially 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.