stupid

Adjective

• lacking intelligence
  • a dull job with lazy and unintelligent co-workers
    

• 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
    

• lacking or marked by lack of intellectual acuity

Noun

• a person who is not very bright
  • The economy, stupid!
    

Related words

• Synonyms: 
  unintelligent , dazed , stunned , stupefied , stupid(p) , stupid person , stupe , dullard , dolt , pudding head , pudden-head , poor fish , pillock
• Antonyms: 
  intelligent , smart