"dense" in the adjective sense
1. dense, heavy, impenetrable
permitting little if any light to pass through because of denseness of matter
2. dense, thick
hard to pass through because of dense growth
having high relative density or specific gravity
"dense as lead"
4. dense, dim, dull, dumb, obtuse, slow
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"
Source: WordNet® (An amazing lexical database of English)
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