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Definition of deep:

  1. Extending far back from the front or outer part; of great horizontal dimension ( measured backward from the front or nearer part, mouth, etc.); as, a deep cave or recess or wound; a gallery ten seats deep; a company of soldiers six files deep.
  2. Extending far below the surface; of great perpendicular dimension ( measured from the surface downward, and distinguished from high, which is measured upward); far to the bottom; having a certain depth; as, a deep sea.
  3. Hard to penetrate or comprehend; profound; - opposed to shallow or superficial; intricate; mysterious; not obvious; obscure; as, a deep subject or plot.
  4. Low in situation; lying far below the general surface; as, a deep valley.
  5. Muddy; boggy; sandy; - said of roads.
  6. Of penetrating or far- reaching intellect; not superficial; thoroughly skilled; sagacious; cunning.
  7. Profound; thorough; complete; unmixed; intense; heavy; heartfelt; as, deep distress; deep melancholy; deep horror.
  8. Strongly colored; dark; intense; not light or thin; as, deep blue or crimson.
  9. That which is deep, especially deep water, as the sea or ocean; an abyss; a great depth.
  10. That which is profound, not easily fathomed, or incomprehensible; a moral or spiritual depth or abyss.
  11. To a great depth; with depth; far down; profoundly; deeply.


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