Dictionary.net

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"

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"

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

a long steep-sided depression in the ocean floor

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

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

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

very distant in time or space; "deep in the past"; "deep in enemy territory"; "deep in the woods"; "a deep space probe"

relatively deep or strong; affecting one deeply; "a deep breath"; "a deep sigh"; "deep concentration"; "deep emotion"; "a deep trance"; "in a deep sleep"

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".

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

large in quantity or size; "deep cuts in the budget"

extreme; "in deep trouble"; "deep happiness"

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

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

relatively thick from top to bottom; "deep carpets"; "deep snow"

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"

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

a long steep-sided depression in the ocean floor

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

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

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

very distant in time or space; "deep in the past"; "deep in enemy territory"; "deep in the woods"; "a deep space probe"

relatively deep or strong; affecting one deeply; "a deep breath"; "a deep sigh"; "deep concentration"; "deep emotion"; "a deep trance"; "in a deep sleep"

Extending far below the surface; of great perpendicular dimension (measured from the surface downward, and distinguished from high, which is measured upward); far to the bottom; having a certain depth; as, a deep sea.

Extending far back from the front or outer part; of great horizontal dimension (measured backward from the front or nearer part, mouth, etc.); as, a deep cave or recess or wound; a gallery ten seats deep; a company of soldiers six files deep.

Low in situation; lying far below the general surface; as, a deep valley.

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

Profound; thorough; complete; unmixed; intense; heavy; heartfelt; as, deep distress; deep melancholy; deep horror.

Strongly colored; dark; intense; not light or thin; as, deep blue or crimson.

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.

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

Hard to penetrate or comprehend; profound; - opposed to shallow or superficial; intricate; mysterious; not obvious; obscure; as, a deep subject or plot.

Muddy; boggy; sandy; - said of roads.

Extending far below the surface; of great perpendicular dimension (measured from the surface downward, and distinguished from high, which is measured upward); far to the bottom; having a certain depth; as, a deep sea.

Extending far back from the front or outer part; of great horizontal dimension (measured backward from the front or nearer part, mouth, etc.); as, a deep cave or recess or wound; a gallery ten seats deep; a company of soldiers six files deep.

Low in situation; lying far below the general surface; as, a deep valley.

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

Profound; thorough; complete; unmixed; intense; heavy; heartfelt; as, deep distress; deep melancholy; deep horror.

Strongly colored; dark; intense; not light or thin; as, deep blue or crimson.

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.

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

Hard to penetrate or comprehend; profound; - opposed to shallow or superficial; intricate; mysterious; not obvious; obscure; as, a deep subject or plot.

Muddy; boggy; sandy; - said of roads.

Of low tone; full-toned; not high or sharp; grave; heavy.

Extending far below the surface; as, a deep well; extending far back; as, a deep, lot; penetrating; sagacious; profound; difficult to understand; as philosophy is a deep subject; absorbed; grave in tone, or low in pitch; intense; heavy; as, a deep sleep; strongly colored.

That which extends far downward; a great body of water; an abyss; the culmination; as, the deep of night.

Deepness.

Deepness.

Beneath the surface.

Deeply.

Extending far downward, backward, or inward; profound; extreme; heartfelt.

Sagacious; penetrating; also, scheming; designing.

Low in tone; dark in hue.

That which has great depth; an abyss; the sea.

Deeply.

Extending far down; low; artful; secret; profound.

The sea; an abyss.

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

n. That which is deep, especially, deep water; the sea or ocean;—that which is profound or not easily fathomed;—the most quiet or profound part; the midst.

Measured from the surface downward; entering far, piercing a great way; far from the outer part; not superficial, not obvious; sagacious, penetrating; full of contrivance, politick, insidious; grave, solemn; dark-coloured; having a great degree of stilness or gloom; bass, grave in sound.

The sea, the main; the most solemn or still part.