adj. dens·er,
dens·est 1. a. Having relatively high density.
b. Crowded closely together; compact: a dense population.
2. Hard to penetrate; thick: a dense jungle.
3. a. Permitting little light to pass through, because of compactness of matter: dense glass; a dense fog.
b. Opaque, with good contrast between light and dark areas. Used of a photographic negative.
4. Difficult to understand because of complexity or obscurity: a dense novel.
5. Slow to apprehend; thickheaded.