Definitions
1.noun(with "the") The deep part of a lake, sea, etc."creatures of the deep"
2.noun(with "the") A silent time; quiet isolation."the deep of night"
3.nounA deep shade of colour.
4.nounThe profound part of a problem.
5.noun(with "the") The sea, the ocean.
6.nounA fielding position near the boundary."Russell is a safe pair of hands in the deep."
7.adjective(of a physical distance) Extending far away from a point of reference, especially downwards.
8.adjective(intellectual, social) Complex, involved.
9.adjective(sound, voice) Low in pitch."She has a very deep contralto voice."
10.adjective(of a color) Highly saturated."That's a very deep shade of blue."
11.adjective(sleep) Sound, heavy (describing a state of sleep from which one is not easily awoken)."He was in a deep sleep."
12.adjectiveImmersed, submerged (in)."deep in debt"
13.adjectiveMuddy; boggy; sandy; said of roads.
14.adjective(of time) Distant in the past, ancient."deep time"
15.adverbDeeply.