- thickly crowded or closely set: a dense crowd
- thick; impenetrable
- having a high density
- stupid; dull; obtuse
- (of a photographic negative) having many dark or exposed areas
WordReference Random House Learner's Dictionary of American English © 2015
- having parts closely packed together;
crowded:a dense forest.
- stupid; slow-witted.
difficult to see through:a very dense fog.
- difficult to understand:dense writing.
dense•ness, n. [uncountable]