unfamiliar · adjective /ʌn.fəˈmɪl.i.ər/Full view
Nouns: familiarity, family
Adjectives: familiar, unfamiliar
Verbs: familiarize
Adverbs: familiarly
unfamiliar
B2 not known to you
Dictionary examples:

I noticed several unfamiliar faces in the meeting room.

His name was unfamiliar to me.

Learner example:

On the other hand, you may not like some dishes, because they may be unfamiliar to you. (First Certificate in English; B2; Russian)

be unfamiliar with sth
B2 to not have any knowledge or experience of something
Dictionary example:

A lot of people are unfamiliar with the system.

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