dense, thick, and compact mean having parts that are gathered tightly together. dense is used of something in which the parts are very close together. They lost their way in the dense forest. thick is used of something that has many small parts that form a single mass.

Does dense mean a lot?

Something that is dense contains a lot of things or people in a small area.

Does dense mean dumb?

stupid; slow-witted; dull. intense; extreme: dense ignorance.