having the component parts closely compacted together; crowded or compact

a dense forest; dense population.

stupid; slow-witted; dull.

intense; extreme

dense ignorance.

relatively opaque; transmitting little light, as a photographic negative, optical glass, or color.

difficult to understand or follow because of being closely packed with ideas or complexities of style

a dense philosophical essay.

Mathematics . of or pertaining to a subset of a topological space in which every neighborhood of every point in the space contains at least one point of the subset.

adjective

open , scattered , sparse , thin , uncompressed , brainy , clever , intelligent , smart

adjective

close , close-knit , compact , condensed , crammed , crowded , heaped , heavy , impenetrable , jammed , jam-packed , massed , opaque , packed , packed like sardines , piled , solid , substantial , thickset , blockheaded , boorish , doltish , dull , dumb , fatheaded , ignorant , imbecilic , impassive , lethargic , numskulled , oafish , obtuse , phlegmatic , simple , slow-witted , sluggish , stolid , thick , torpid , tight , lush , luxuriant , profuse , rank , hebetudinous , thickheaded , thick-witted , deep , firm , foggy , slow