Dense

Part of speech: adjective (a.)

1. Having the constituent parts massed or crowded together; close; compact; thick; containing much matter in a small space; heavy; opaque; as, a dense crowd; a dense forest; a dense fog. All sorts of bodies, firm and fluid, dense and rare. Ray. To replace the cloudy barrier dense. Cowper.

2. Stupid; gross; crass; as, dense ignorance.