Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “deep”

deep

adjective, adverb [-er/-est only]  /dip/ us  

deep adjective, adverb [-er/-est only] (DOWN)

going or being a long way down from the top or surface, or being at a particular distance down from the top: She had a deep cut on her left arm. During the flood, the water in the basement was knee-deep (= it would reach the knees of an average adult).

deep

adjective  /dip/ us  

deep adjective (FRONT TO BACK)

having a (sometimes stated) distance from front to back: I want the bookcase shelves to be 12 inches deep. The crowd along the parade route was six deep (= in six rows).

deep adjective (STRONGLY FELT)

strongly felt or experienced, or having a strong and lasting effect: Our deep love for each other will last forever. He awoke from a deep sleep. Joseph, deep in thought (= thinking so much that he is not aware of others), didn’t hear Erin enter the room.

deep adjective (COMPLICATED)

[-er/-est only] difficult to understand; complicated: His book on how the brain works is too deep for me.

deep adjective (LOW SOUND)

[-er/-est only] (of a sound) low: He was a large man with a deep voice.

deep adjective (DARK)

[-er/-est only] (of a color) strong and dark: The sky is a deep blue.
(Definition of deep from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of deep?
Browse related topics

You are looking at an entry to do with Experiencing difficulties, but you might be interested in these topics from the Easy and difficult topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “deep” in other dictionaries

Word of the Day

innovate

to introduce changes and new ideas

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More