The noun stupid has 1 sense (first 1 from tagged texts)
1. (1) stupid, stupid person, stupe, dullard, dolt, pudding head, pudden-head, poor fish, pillock -- (a person who is not very bright; "The economy, stupid!")
Overview of adj stupid
The adj stupid has 3 senses (first 2 from tagged texts)
1. (10) stupid -- (lacking or marked by lack of intellectual acuity)
2. (1) dazed, stunned, stupefied, stupid -- (in a state of mental numbness especially as resulting from shock; "he had a dazed expression on his face"; "lay semiconscious, stunned (or stupefied) by the blow"; "was stupid from fatigue")
3. unintelligent, stupid -- (lacking intelligence; "a dull job with lazy and unintelligent co-workers")