Main entry: dim, dense, dull, dumb, obtuse, slow
Definition: slow to learn or understand; lacking intellectual acuity
Usage: 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
Main entry: dense
Definition: having high relative density or specific gravity
Usage: dense as lead
Definition: hard to pass through because of dense growth
Usage: dense vegetation; thick woods
Main entry: dense, impenetrable, heavy
Definition: permitting little if any light to pass through because of denseness of matter
Usage: dense smoke; heavy fog; impenetrable gloom