DictionarydeepPhysical depth
adjective / adverb / noun

deep

DEEP/diːp/

Extending far beneath a surface or into a space.

The narrow well is deep, extending far below the ground.

A cross-section of a deep narrow well descending far below ground.
Etymology

Old English deop described distance below a surface and already also meant “profound.” That pairing connects physical depth with intellectual depth: reaching far into a subject rather than remaining at its surface.

In context

Natural World Facts76:59
the deep sea is without a doubt alien to us this great void extending far beneath the surface
Into the Abyss: Creatures of the Midwater (Full Movie)

More examples

  • This deep drawer holds all our largest pots.
  • The tree's roots reach deep into the soil.
  • Whales rise from the deep to breathe.

Forms

deep · deeper · deepest · deeps

depth noun — Distance below a surface or inward.

deepen verb — To make or become physically deeper.

Similar words

bottomless
Suggests no reachable bottom, rather than simply great depth.