Meaning of “unfamiliar” - Learner’s Dictionary

unfamiliar

adjective uk us /ˌʌnfəˈmɪljər/

B2 not known to you:

an unfamiliar face
His name was unfamiliar to me.
be unfamiliar with sth

B2 to not have any knowledge or experience of something:

Many older people are unfamiliar with computers.

(Definition of “unfamiliar” from the Cambridge Learner’s Dictionary © Cambridge University Press)