Adjective

(en adjective)

Unaffected or unable to be affected by.

*

, title=(The Celebrity), chapter=5 , passage=Although the Celebrity was almost impervious to sarcasm, he was now beginning to exhibit visible signs of uneasiness, the consciousness dawning upon him that his eccentricity was not receiving the ovation it merited.}}

Preventive of any penetration; impenetrable, impermeable, particularly of water.

Immune to damage or effect.

Adjective

(er)

Having relatively high density.

Compact; crowded together.

Thick; difficult to penetrate.

*, chapter=13

, title= The Mirror and the Lamp , passage=And Vickers launched forth into a tirade very different from his platform utterances. He spoke with extreme contempt of the dense stupidity exhibited on all occasions by the working classes. He said that if you wanted to do anything for them, you must rule them, not pamper them.}}

Opaque; allowing little light to pass through.

Obscure, or difficult to understand.

(mathematics, topology) Being a subset of a topological space that approximates the space well. See Wikipedia article on (dense set)s for mathematical definition.

Of a person, slow to comprehend; of low intelligence.