dense,
dumb,
obtuse,
dim,
slow,
dull slow to learn or understand; lacking intellectual acuity; "so dense he never understands anything I say to him"; "never met anyone quite so dim"; "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray; "dumb officials make some really dumb decisions"; "he was either normally stupid or being deliberately obtuse"; "worked with the slow students"
intelligent having the capacity for thought and reason especially to a high degree; "is there intelligent life in the universe?"; "an intelligent question"
retarded relatively slow in mental or emotional or physical development; "providing a secure and sometimes happy life for the retarded"
stupid lacking or marked by lack of intellectual acuity
intelligence the operation of gathering information about an enemy
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"
