deep in WordNet English dictionary

1. difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge
   "the professor's lectures were so abstruse that students tended to avoid them"; "a deep metaphysical theory"; "some recondite problem in historiography"
   abstruse  deep  recondite 
   
2. having or denoting a low vocal or instrumental range
   "a deep voice"; "a bass voice is lower than a baritone voice"; "a bass clarinet"
   bass  deep 
   
3. of an obscure nature
   "the new insurance policy is written without cryptic or mysterious terms"; "a deep dark secret"; "the inscrutable workings of Providence"; "in its mysterious past it encompasses all the dim origins of life"- Rachel Carson; "rituals totally mystifying to visitors from other lands"
   cryptic  cryptical  deep  inscrutable  mysterious  mystifying 
   
4. having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination
   "a deep well"; "a deep dive"; "deep water"; "a deep casserole"; "a deep gash"; "deep massage"; "deep pressure receptors in muscles"; "deep shelves"; "a deep closet"; "surrounded by a deep yard"; "hit the ball to deep center field"; "in deep space"; "waist-deep"
   deep 
   
5. relatively deep or strong; affecting one deeply
   "a deep breath"; "a deep sigh"; "deep concentration"; "deep emotion"; "a deep trance"; "in a deep sleep"
   deep 
   
6. exhibiting great cunning usually with secrecy
   "deep political machinations"; "a deep plot"
   deep 
   
7. strong; intense
   "deep purple"; "a rich red"
   deep  rich 
   
8. very distant in time or space
   "deep in the past"; "deep in enemy territory"; "deep in the woods"; "a deep space probe"
   deep 
   
9. extreme
   "in deep trouble"; "deep happiness"
   deep 
   
10. large in quantity or size
    "deep cuts in the budget"
    deep 
    
11. with head or back bent low
    "a deep bow"
    deep 
    
12. marked by depth of thinking
    "deep thoughts"; "a deep allegory"
    deep 
    
13. relatively thick from top to bottom
    "deep carpets"; "deep snow"
    deep 
    
14. extending relatively far inward
    "a deep border"
    deep 
    
15. (of darkness) very intense
    "thick night"; "thick darkness"; "a face in deep shadow"; "deep night"
    thick  deep 
    

1. a long steep-sided depression in the ocean floor
   trench  deep  oceanic abyss 
   
2. literary term for an ocean
   "denizens of the deep"
   deep 
   
3. the central and most intense or profound part
   "in the deep of night"; "in the deep of winter"
   deep 
   

1. to a great depth;far down
   "dived deeply"; "dug deep"
   deeply  deep  deeply  deep 
   
2. to an advanced time
   "deep into the night"; "talked late into the evening"
   deep  late  deep  late 
   
3. to a great distance
   "penetrated deep into enemy territory"; "went deep into the woods"
   deep  deep