| adjective | permitting little if any light to pass through because of denseness of matter “dense smoke” |
| adjective | hard to pass through because of dense growth “dense vegetation” |
| adjective | having high relative density or specific gravity “dense as lead” |
| adjective | slow to learn or understand; lacking intellectual acuity; ; ; - Thackeray “so dense he never understands anything I say to him” |
| density | noun | the amount per unit size |
| denseness | noun | the spatial property of being crowded together |
| thickness | noun | the dimension through an object as opposed to its length or width |
| dullness | noun | the quality of being slow to understand |
| dumbness | noun | the quality of being mentally slow and limited |
| obtuseness | noun | the quality of being slow to understand |
| slowness | noun | unskillfulness resulting from a lack of training |