from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Extending far downward below a surface.
  • adjective Extending far inward from an outer surface.
  • adjective Extending far backward from front to rear.
  • adjective Extending far from side to side from a center.
  • adjective Far distant down or in.
  • adjective Coming from or penetrating to a depth.
  • adjective Sports Located or taking place near the outer boundaries of the area of play.
  • adjective Extending a specific distance in a given direction.
  • adjective Far distant in time or space.
  • adjective Difficult to penetrate or understand; recondite.
  • adjective Of a mysterious or obscure nature.
  • adjective Very learned or intellectual; wise.
  • adjective Exhibiting great cunning or craft.
  • adjective Of a grave or extreme nature.
  • adjective Very absorbed or involved.
  • adjective Profound in quality or feeling.
  • adjective Rich and intense in shade. Used of a color.
  • adjective Low in pitch; resonant.
  • adjective Covered or surrounded to a designated degree. Often used in combination.
  • adjective Large in quantity or size; big.
  • adjective Sports Having a sufficient number of capable reserve players.
  • adverb To a great depth; deeply.
  • adverb Well along in time; late.
  • adverb Sports Close to the outer boundaries of the area of play.
  • noun A deep place in land or in a body of water.
  • noun A vast, immeasurable extent.
  • noun The extent of encompassing time or space; firmament.
  • noun The most intense or extreme part.
  • noun The ocean.
  • noun Nautical A distance estimated in fathoms between successive marks on a sounding line.
  • idiom (deep down) At bottom; basically.
  • idiom (in deep water) In difficulty.

from The Century Dictionary.

  • To become deep; deepen.
  • To go deep; sink.
  • Deeply.
  • Having considerable or great extension downward, or in a direction viewed as analogous with downward.
  • As measured from the point of view: extending far above; lofty: as, a deep sky.
  • As measured from without inward: extending or entering far within; situated far within or toward the center.
  • As measured from the front backward: long: as, a deep house; a deep lot.
  • Having (a certain) extension as measured from the surface downward or from the front backward: as, a mine 1,000 feet deep; a case 12 inches long and 3 inches deep; a house 40 feet deep; a file of soldiers six deep.
  • Immersed; absorbed; engrossed; wholly occupied: as,deep in figures.
  • Closely involved or implicated.
  • Hard to get to the bottom or foundation of; difficult to penetrate or understand; not easily fathomed; profound; abstruse.
  • Sagacious; penetrating; profound: as, a man of deep insight.
  • Artful; contriving; plotting; insidious; designing: as, he is a deep schemer.
  • Grave in sound; low in pitch: as, the deep tones of an organ.


from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English dep, from Old English dēop; see dheub- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English depe, from Old English dēop ("deep, profound; awful, mysterious; heinous; serious, solemn, earnest; extreme, great"), from Proto-Germanic *deupaz (“deep”), from Proto-Indo-European *dʰewb- (“deep”). Cognate with Scots depe ("deep"), Eastern Frisian djap ("deep"), West Frisian djip ("deep"), Dutch diep ("deep"), German tief ("deep"), Swedish djup ("deep"), Icelandic djúpur ("deep"), Lithuanian dubùs ("deep, hollow"), Albanian det ("sea"), Welsh dwfn ("deep").



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