Unfamiliar: adj. (not known and/or not completely known) and/or not easily perceived when viewed and/or shown
A new tool may be unfamiliar or a new city may be unfamiliar and you recognize familiar subsets in the tool or familiar houses and stores in a new city but you are not very certain or familiar with how to use the new tool or you are not familiar with easy navigation through a new city.
Unfamiliar subsets in a familiar set are enough to make a set unfamiliar to some degree which need not be total unfamiliarity.
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