Adjective
1. permitting little if any light to pass through because of denseness of matter;
"dense smoke""heavy fog""impenetrable gloom"2. closely crowded together;
"a compact shopping center""a dense population""thick crowds"3. hard to pass through because of dense growth;
"dense vegetation""thick woods"4. having high relative density or specific gravity;
"dense as lead"5. 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"