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deep

Dictionary definition · deep

noun

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

adjective

  1. relatively deep or strong; affecting one deeply"a deep breath"
  2. marked by depth of thinking"deep thoughts"
  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"
  4. very distant in time or space"deep in the past"
  5. intense or extreme"in deep trouble"
  6. having or denoting a low vocal or instrumental range"a deep voice"

adverb

  1. to a great depth; far down or in"dived deeply"
  2. to an advanced time"deep into the night"
  3. to a great distance"penetrated deep into enemy territory"

Source: Open English WordNet (CC BY 4.0).