1 adjective, adverb
un‧known1 W2
1 not known about:
The murderer's identity remains unknown.
For some unknown reason, Mark quit his job and moved to Greece.
a voyage through unknown territory
An unknown number of people were killed.
2 not famous:
an unknown artist

unknown to somebody

without someone knowing:
Unknown to his wife, Ron had been having an affair.

be an unknown quantity

if someone or something is an unknown quantity, you do not know what their abilities are or how they are likely to behave
WORD FOCUS: famous WORD FOCUS: famous
similar words: well-known, celebrated, renowned, eminent, noted, legendary

famous for doing something bad: notorious, infamous

not famous: little-known, unknown, obscure

a famous person: celebrity, celeb informal, star

See also

Dictionary results for "unknown"
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