(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")
dense, dim, dull, dumb, obtuse, slow
synonim: tępy

adj dull, obtuse