(of a physical distance) Extending far away from a point of reference, especially downwards.
(intellectual, social) Complex, involved.
(sound, voice) Low in pitch.
She has a very deep contralto voice.
(of a color) Highly saturated.
That's a very deep shade of blue.
(sleep) Sound, heavy (describing a state of sleep from which one is not easily awoken).
He was in a deep sleep.
Immersed, submerged (in).
deep in debt
Muddy; boggy; sandy; said of roads.
(of time) Distant in the past, ancient.
deep time