stupid

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

lacking or marked by lack of intellectual acuity

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 intelligence; "a dull job with lazy and unintelligent co-workers"