#1 dense s. [heavy, impenetrable] permitting little if any light to pass through because of denseness of matter; "dense smoke"; "heavy fog"; "impenetrable gloom". wn
#2 dense s. having high relative density or specific gravity; "dense as lead". wn
#3 dense s. [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 mak. wn
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