WordWeb Online

1. Of the greatest intensity; complete
   "a profound silence"; "a state of profound shock"
    
2. Showing intellectual penetration or emotional depth
   "the differences are profound"; "a profound insight"; "a profound book"; "a profound mind"; "profound contempt"; "profound regret"
    
3. Far-reaching and thoroughgoing in effect especially on the nature of something
   "profound social changes";
   - fundamental
    
4. Coming from deep within one
   "a profound sigh"
    
5. (of sleep) deep and complete
   "fell into a profound sleep";
   - heavy, sound, wakeless
    
6. Situated at or extending to great depth; too deep to have been sounded or plumbed
   "the profound depths of the sea";
   - unfathomed, unplumbed, unsounded

Derived forms: profoundest, profounder

See also: deep, important, intense, scholarly, significant, thoughtful

Antonym: superficial

Encyclopedia: Profound