1. Having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a centre; sometimes used in combination
   "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 centre field"; "in deep space"; "waist-deep"; "a deep well"; "a deep dive"
    
2. Marked by depth of thinking
   "deep thoughts"; "a deep allegory"
    
3. Intense or extreme
   "in deep trouble"; "deep happiness"
    
4. Not easily disturbed or changed; big or strong
   "deep concentration"; "deep emotion"; "a deep trance"; "in a deep sleep"; "a deep breath"; "a deep sigh"
    
5. Very distant in time or space
   "deep in the woods"; "a deep space probe"; "deep in the past"; "deep in enemy territory"
    
6. Extending relatively far inward
   "a deep border"
    
7. Relatively thick from top to bottom
   "deep carpets"; "deep snow"
    
8. Difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge
   "a deep metaphysical theory";
   - abstruse, recondite
    
9. Strong; intense
   "deep purple";
   - rich
    
10. Large in quantity or size
    "deep cuts in the budget"
     
11. (of darkness) densely dark
    "a face in deep shadow"; "deep night";
    - thick
     
12. Having or denoting a low vocal or instrumental range
    "a deep voice";
    - bass
     
13. Of an obscure nature
    "a deep dark secret";
    - cryptic, cryptical, inscrutable, mysterious, mystifying
     
14. Exhibiting great cunning usually with secrecy
    "deep political machinations"; "a deep plot"
     
15. With head or back bent low
    "a deep bow"

1. To a great depth; far down or in
   "dug deep";
   - deeply
    
2. To a great distance
   "penetrated deep into enemy territory"; "went deep into the woods"
    
3. To an advanced time
   "deep into the night";
   - late

1. The central and most intense or profound part
   "in the deep of night"; "in the deep of winter"
    
2. A long steep-sided depression in the ocean floor
   "The Mariana deep is the deepest known oceanic abyss";
   - trench, oceanic abyss
    
3. Literary term for an ocean
   "denizens of the deep"

Derived forms: deeper, deepest, deeps

See also: abysmal [literary], abyssal, artful, big, bottomless, broad, colorful [US], colourful [Brit, Cdn], deepness, deep-water, depth, distant, esoteric, heavy, incomprehensible, inexplicable, intense, large, low, low-pitched, profound, sound, thick, unfathomable, unfathomed, unplumbed, unsounded, wakeless, walk-in, wide

Type of: depression, middle, natural depression, ocean

Antonym: shallow

Encyclopedia: Deep, Deep Trouble