Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “unknown”

unknown

adjective uk   /ʌnˈnəʊn/ us    /-ˈnoʊn/
B1 not known or familiar: The exact number of people carrying the virus is unknown. As recently as six months ago her name was almost unknown in Britain. Unknown to me, she'd organized a party for my birthday.Unknown and unfamiliar

unknown

noun uk   /ʌnˈnəʊn/ us    /-ˈnoʊn/
C1 [S] what is not familiar or known: Racism is in some ways just a fear of the unknown.Unknown and unfamiliar [C] a person, especially a performer or sports player, who is not famous: For her latest film she deliberately chose a cast of unknowns.People of little importance [C] mainly US something that cannot be guessed at or calculated because so little is known about it: It's the big unknowns that make insurance companies uneasy.Unknown and unfamiliar
(Definition of unknown from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of unknown?
Add Cambridge dictionaries to your browser to your website

Definitions of “unknown” in other dictionaries

Word of the Day

stampede

When animals or people stampede, they all move quickly in the same direction, often because they are frightened.

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