unknown

US /ˌʌnˈnoʊn/

UK /ˌʌnˈnəʊn/

B1
adj.AdjectiveNot being known or famous
He was unknown until he published his first novel
n. (c.)Countable NounPerson who is not famous or known by many
He was an unknown until he died, but his work became famous after his death
adj.AdjectiveBeing unfamiliar or not known
Fear of the unknown is common for every human being

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