deep

1. (with "the") The deep part of a lake, sea, etc.

   creatures of the deep

2. (with "the") A silent time; quiet isolation.

   the deep of night

3. A deep shade of colour.
4. The profound part of a problem.
5. (with "the") The sea, the ocean.
6. A fielding position near the boundary.

   Russell is a safe pair of hands in the deep.

1. (of a physical distance) Extending far away from a point of reference, especially downwards.
2. (intellectual, social) Complex, involved.
3. (sound, voice) Low in pitch.

   She has a very deep contralto voice.

4. (of a color) Highly saturated.

   That's a very deep shade of blue.

5. (sleep) Sound, heavy (describing a state of sleep from which one is not easily awoken).

   He was in a deep sleep.

6. Immersed, submerged (in).

   deep in debt

7. Muddy; boggy; sandy; said of roads.
8. (of time) Distant in the past, ancient.

   deep time

adverb

Deeply.