extending far down from the top or surface: a deep well; a deep valley.
extending far in or back from the front or from an edge, surface, opening, etc., considered as the front: a deep shelf.
extending far in width; broad: deep lace; a deep border.
ranging far from the earth and sun: a deep space probe.
having a specified dimension in depth: a tank 8 feet deep.
covered or immersed to a specified depth (often used in combination): standing knee-deep in water.
having a specified width or number of items from front to back (often used in combination): shelves that are 10 inches deep; cars lined up at the entrance gates three-deep.
extending or cutting far down relative to the surface of a given object: The knife made a deep scar in the table.
situated far down, in, or back: deep below the surface; deep in the woods.
reaching or advancing far down: a deep dive.
coming from far down: a deep breath.
made with the body bent or lowered to a considerable degree: a deep bow.
immersed or submerged in or heavily covered with (followed by in): a road deep in mud.
difficult to penetrate or understand; abstruse: a deep allegory.
not superficial; profound: deep thoughts.
grave or serious: deep disgrace.
heartfelt; sincere: deep affections.
absorbing; engrossing: deep study.
great in measure; intense; extreme: deep sorrow.
sound and heavy: deep sleep.
(of colors) dark and vivid: a deep red.
low in pitch, as sound, a voice, or the like: deep, sonorous tones.
having penetrating intellectual powers: a deep scholar.
profoundly cunning or artful: a deep and crafty scheme.
mysterious; obscure: deep, dark secrets.
immersed or involved; enveloped: a man deep in debt.
absorbed; engrossed: deep in thought.
Baseball. relatively far from home plate: He hit the ball into deep center field.
Linguistics. belonging to an early stage in the transformational derivation of a sentence; belonging to the deep structure.
noun
the deep part of a body of water, especially an area of the ocean floor having a depth greater than 18,000 feet (5,400 meters).
a vast extent, as of space or time.
the part of greatest intensity, as of winter.
Nautical. any of the unmarked levels, one fathom apart, on a deep-sea lead line.Compare mark1 (def. 20).
the deep,Chiefly Literary. the sea or ocean: He was laid to rest in the deep.
adverb,deep·er,deep·est.
to or at a considerable or specified depth: The boat rode deep in the water.
far on in time: He claimed he could see deep into the future.
profoundly; intensely.
Baseball. at or to a deep place or position: The outfielders played deep, knowing the batter's reputation as a slugger.
Idioms for deep
go off the deep end,
to enter upon a course of action with heedless or irresponsible indifference to consequences.
to become emotionally overwrought.
in deep,
inextricably involved.
having made or committed oneself to make a large financial investment.
in deep water,
in difficult or serious circumstances; in trouble.
in a situation beyond the range of one's capability or skill: You're a good student, but you'll be in deep water in medical school.
Origin of deep
First recorded before 900; Middle English dep, Old English dēop; akin to Gothic diups, Old Norse djupr, Dutch diep, Old High German tiof; akin to dip1, dive