Definitions from Wiktionary ( )

▸ adjective:  (of distance or position; also figurative) Extending far away from a point of reference, especially downwards.
▸ adjective:  Extending far down from the top, or surface, to the bottom, literally or figuratively.
▸ adjective:  Far in extent in another (non-downwards, but generally also non-upwards) direction away from a point of reference.
▸ adjective:  (in combination) Extending to a level or length equivalent to the stated thing.
▸ adjective:  In a (specified) number of rows or layers.
▸ adjective:  Thick.
▸ adjective:  Voluminous.
▸ adjective:  Positioned or reaching far, especially down through something or into something.
▸ adjective:  (cricket, baseball, softball) Far from the center of the playing area, near to the boundary of the playing area, either in absolute terms or relative to a point of reference.
▸ adjective:  (sports such as soccer, tennis) Penetrating a long way, especially a long way forward.
▸ adjective:  (sports such as soccer, American football, tennis) Positioned back, or downfield, towards one's own goal, or towards or behind one's baseline or similar reference point.
▸ adjective:  (anatomy, often with to) Further into the body.
▸ adjective:  (intellectual, social) Complex, involved.
▸ adjective:  Profound, having great meaning or import, but possibly obscure or not obvious.
▸ adjective:  Significant, not superficial, in extent.
▸ adjective:  Hard to penetrate or comprehend; profound; intricate; obscure.
▸ adjective:  Of penetrating or far-reaching intellect; not superficial; thoroughly skilled; sagacious; cunning.
▸ adjective:  Inner, underlying, true; relating to one’s inner or private being rather than what is visible on the surface.
▸ adjective:  (sound, voice) Low in pitch.
▸ adjective:  (of a color or flavour) Highly saturated; rich.
▸ adjective:  (sleep) Sound, heavy (describing a state of sleep from which one is not easily awoken).
▸ adjective:  Muddy; boggy; sandy; said of roads.
▸ adjective:  (of time) Distant in the past, ancient.
▸ adverb:  Far, especially far down through something or into something, physically or figuratively.
▸ adverb:  (also deeply) In a profound, not superficial, manner.
▸ adverb:  (also deeply) In large volume.
▸ adverb:  (sports) Back towards one's own goal, baseline, or similar.
▸ noun:  (literary, with "the") The deep part of a lake, sea, etc.
▸ noun:  (with "the") The sea, the ocean.
▸ noun:  A deep hole or pit, a water well; an abyss.
▸ noun:  A deep or innermost part of something in general.
▸ noun:  (literary, with "the") A silent time; quiet isolation.
▸ noun:  (rare) A deep shade of colour.
▸ noun:  (US, rare) The profound part of a problem.
▸ noun:  (cricket) A fielding position near the boundary.
▸ noun:  A surname.

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