Obscure, or difficult to understand.
Opaque; allowing little light to pass through.
Thick; difficult to penetrate.
Slow to comprehend; of low intelligence.
Having relatively high density.
Compact; crowded together.
Being a subset of a topological space that approximates the space well. See the Wikipedia article on dense sets for a mathematical definition.
A thicket.
Able to hear, as opposed to deaf.
The sense used to perceive sound.
A proceeding at which discussions are heard.
The act by which something is heard.
A legal procedure done before a judge, without a jury, as with an evidentiary hearing.