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Definition of 'deep'


  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
       Synonyms: trench oceanic abyss
  3. literary term for an ocean; "denizens of the deep"


  1. relatively deep or strong; affecting one deeply; "a deep breath"; "a deep sigh"; "deep concentration"; "deep emotion"; "a deep trance"; "in a deep sleep"
       Antonyms: shallow
  2. marked by depth of thinking; "deep thoughts"; "a deep allegory"
  3. 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"
       Antonyms: shallow
  4. very distant in time or space; "deep in the past"; "deep in enemy territory"; "deep in the woods"; "a deep space probe"
  5. extreme; "in deep trouble"; "deep happiness"
  6. having or denoting a low vocal or instrumental range; "a deep voice"; "a bass voice is lower than a baritone voice"; "a bass clarinet"
       Synonyms: bass
  7. strong; intense; "deep purple"; "a rich red"
       Synonyms: rich
  8. relatively thick from top to bottom; "deep carpets"; "deep snow"
  9. extending relatively far inward; "a deep border"
  10. (of darkness) very intense; "thick night"; "thick darkness"; "a face in deep shadow"; "deep night"
       Synonyms: thick
  11. large in quantity or size; "deep cuts in the budget"
  12. with head or back bent low; "a deep bow"
  13. 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"
       Synonyms: cryptic cryptical inscrutable mysterious mystifying
  14. 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"
       Synonyms: abstruse recondite
  15. exhibiting great cunning usually with secrecy; "deep political machinations"; "a deep plot"


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

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