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Definition of deep : 1. 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.
2. 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.
3. Hard to penetrate or comprehend; profound; - opposed to shallow or superficial; intricate; mysterious; not obvious; obscure; as, a deep subject or plot.
4. Low in situation; lying far below the general surface; as, a deep valley.
5. Muddy; boggy; sandy; - said of roads.
6. Of penetrating or far- reaching intellect; not superficial; thoroughly skilled; sagacious; cunning.
7. Profound; thorough; complete; unmixed; intense; heavy; heartfelt; as, deep distress; deep melancholy; deep horror.
8. Strongly colored; dark; intense; not light or thin; as, deep blue or crimson.
9. That which is deep, especially deep water, as the sea or ocean; an abyss; a great depth.
10. That which is profound, not easily fathomed, or incomprehensible; a moral or spiritual depth or abyss.
11. To a great depth; with depth; far down; profoundly; deeply.

Synonyms:

dark, subterranean, depth, esoteric, alto, obscure, high, large, stocky, colorful, artful, sonorous, buddy-buddy, recently, occult, colourful, unsounded, dusky, doubtful, intense, buried, suffering, hidden, abyssal, wide, muddy, inexplicable, dense, orphic, strong, extensive, secret, plentiful, unfathomed, compact, copious, thick, qabalistic, abstruse, deep-water, involved, heavy, inscrutable, surface, belatedly, fatheaded, walk-in, low-pitched, bass, abysm, oceanic abyss, long, intricate, intent, having trouble, unintelligible, duncical, immersed, far, cryptic, narrow, below, gulf, broad, plenteous, thickset, beneath, distant, in depth, submarine, darksome, shallow, wooden-headed, underground, cabalistic, mystical, loggerheaded, fertile, contralto, ambiguous, excite, unplumbed, indistinct, full-bodied, rooted, rapt, preoccupied, cloudy, complicated, recondite, kabbalistic, inmost, duncish, lately, underwater, profoundly, heartfelt, deep-seated, blockheaded, thick-skulled, tardily, inward, difficult, heavyset, mystifying, sound, in difficulty, penetrating, cryptical, trench, dim, absorbed, racy, turbid, thin, deep-rooted, yawning, awareness, big, subaqueous, sincere, robust, ample, complex, late, sibylline, easy, fat, immeasurable, incomprehensible, latterly, impenetrable, boneheaded, thickheaded, in trouble at trouble, productive, deeply, mystic, wakeless, slurred, chummy, rich, enigmatical, under, of late, mysterious

bottomless, profound, sunken, fathomless, abysmal

brink, ocean, sea, main, brine

chasm, hole, abyss, well, crevasse, cavity, bottomless pit, shaft, crater, pit

level, low, flat, bottom, short, stumpy, squat

Usage examples:

• The stream was not deep, so the Laird got out, and went slowly away to a neighbouring cottage to dry his clothes and send for his carriage. - "Annie o' the Banks o' Dee", Gordon Stables.
• Lucindy drew a deep breath. - "The Bishop and the Boogerman", Joel Chandler Harris.
• And you're as deep in that militant business as ever. - "Delia Blanchflower", Mrs. Humphry Ward.