"unacquainted" in the adjective sense
1. innocent, unacquainted
not knowledgeable about something specified
"American tourists wholly innocent of French"
"a person unacquainted with our customs"
2. unacquainted, unacquainted with, unfamiliar with
having little or no knowledge of
"unacquainted with city ways"
Source: WordNet® (An amazing lexical database of English)
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