That which is profound, not easily fathomed, or incomprehensible; a moral or spiritual depth or abyss.

the central and most intense or profound part; "in the deep of night"; "in the deep of winter"

(of darkness) very intense; "thick night"; "thick darkness"; "a face in deep shadow"; "deep night"

of an obscure nature; "the new insurance policy is written without cryptic or mysterious terms"; "a deep dark secret"; "the inscrutible workings of Providence"; "in its mysterious past it encompasses all the dim origins of life"- Rachel Carson; "rituals totally mystifying to visitors from other lands"

difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge; "the professor's lectures were so abstruse that students tended to avoid them"; "a deep metaphysical theory"; "some recondite problem in historiography"

to an advanced time; "deep into the night"; "talked late into the evening"

the distance in fathoms between two successive marks on a lead line, as "By the deep, four."

Of penetrating or far-reaching intellect; not superficial; thoroughly skilled; sagacious; cunning.

To a great depth; with depth; far down; profoundly; deeply.

That which is deep, especially deep water, as the sea or ocean; an abyss; a great depth.

a long steep-sided depression in the ocean floor

literary term for an ocean; "denizens of the deep"

marked by depth of thinking; "deep thoughts"; "a deep allegory"

having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination; "a deep well"; "a deep dive"; "deep water"; "a deep casserole"; "a deep gash"; "deep massage"; "deep pressure receptors in muscles"; "deep shelves"; "a deep closet"; "surrounded by a deep yard"; "hit the ball to deep center field"; "in deep space"; "waist-deep"

extending relatively far inward; "a deep border"

exhibiting great cunning usually with secrecy; "deep political machinations"; "a deep plot"

to a great depth; "dived deeply"; "dug deep"

to far into space; "penetrated deep into enemy territory"; "went deep into the woods";

an adjective that needs to be properly clarified; deep-coloured; deep bouquet; depth of flavour - opposite to superficial. This term indicates a state of multiple layers in the modified noun.

Away from the surface (as opposed to superficial)

Natural gas found at depths greater than the average for a particular area; for NGPA purposes deep gas was natural gas found at depths of more than 15,000 feet, and was not price-regulated.

When a dog is hunting far away from the hunter.

Anatomical term meaning internal; located further beneath the body surface than the superficial structures.

Essentially the same as concentrated, expressing the fact that the wine is rich, full of extract, and mouth filling.

with head or back bent low; "a deep bow"

The low-numbered points in a player's home board, usually the 1 and 2 points.

In color, deep is when a color has low lightness but strong saturation.