Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “unknown”

See all translations

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.
More examples

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. [C] a person, especially a performer or sports player, who is not famous: For her latest film she deliberately chose a cast of unknowns. [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.
(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

piglet

a baby pig

Word of the Day

I won’t tolerate it! Replacing formal words with phrasal verbs.

by Liz Walter,
April 01, 2015
When you are using a language, it is important to understand if a word is formal or informal, so that you can use it in an appropriate way. You might hear people saying dosh for money, or spud for potato, but they wouldn’t write those words in a formal essay. Similarly, a

Read More 

stackin’ p

March 30, 2015
idiom slang earning a lot of money ‘That’s a very generous present.”Yeah, well, she’s stackin’ p, innit?’

Read More