dense dense /ˈdɛns/

adjective

1. () Permitting little if any light to pass through because of denseness of matter  ( heavy , impenetrable , dense )
   permitting little if any light to pass through because of denseness of matter
    Dense smoke
   dense smoke
    Heavy fog
   heavy fog
    Impenetrable gloom
   impenetrable gloom
   
2. () Having high relative density or specific gravity  ( dense )
   having high relative density or specific gravity
    Dense as lead
   dense as lead
   
3. () Hard to pass through because of dense growth  ( thick , dense )
   hard to pass through because of dense growth
    Dense vegetation
   dense vegetation
    Thick woods
   thick woods
   
4. Slow to learn or understand; lacking intellectual acuity  ( dense , dim , obtuse , dull , dumb , slow )
   slow to learn or understand; lacking intellectual acuity
    So dense he never understands anything I say to him
   so dense he never understands anything I say to him
    Never met anyone quite so dim
   never met anyone quite so dim
    Although dull at classical learning, at mathematics he was uncommonly quick
   although dull at classical learning, at mathematics he was uncommonly quick
    Dumb officials make some really dumb decisions
   dumb officials make some really dumb decisions
    He was either normally stupid or being deliberately obtuse
   he was either normally stupid or being deliberately obtuse
    Worked with the slow students
   worked with the slow students