dense

Adjective
  1. Permitting little if any light to pass through because of denseness of matter (synset 302425186)
    "dense smoke"; "heavy fog"; "impenetrable gloom"
    similar to: thick - relatively dense in consistency
    same as: heavy, impenetrable
  2. Hard to pass through because of dense growth (synset 301776384)
    "dense vegetation"; "thick woods"
    similar to: impenetrable - not admitting of penetration or passage into or through
    same as: thick
  3. Having high relative density or specific gravity (synset 301188807)
    "dense as lead"
    similar to: heavy - of comparatively great physical weight or density
  4. Slow to learn or understand;
    Lacking intellectual acuity (synset 300442596)
    "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"; "dumb officials make some really dumb decisions"; "he was either normally stupid or being deliberately obtuse"; "worked with the slow students"
    similar to: stupid - lacking or marked by lack of intellectual acuity
    same as: dim, dull, dumb, obtuse, slow

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