WordWeb Online

1. Permitting little if any light to pass through because of denseness of matter
   "dense smoke";
   - heavy, impenetrable
    
2. Hard to pass through because of dense growth
   "dense vegetation";
   - thick
    
3. Having high relative density or specific gravity
   "dense as lead"
    
4. Taking more than usual time to learn or understand; lacking intellectual acuity
   "so dense he never understands anything I say to him";
   - dim, dull, dumb, obtuse, slow

Sounds like: demean, demesnee, dent

Derived forms: denser, densest

See also: heavy, impenetrable, stupid, thick

Encyclopedia: Dense