stupid

adjective

1
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
2
lacking or marked by lack of intellectual acuity
3
lacking intelligence
a dull job with lazy and unintelligent co-workers

Also useful for “stupid”:Unscrambler— Rearrange the letters in “stupid”