unacquainted_with
1. [ adjective ] not knowledgeable about something specified
Synonyms: innocent_of
Examples:

"American tourists wholly innocent of French" "a person unacquainted with our customs"

Related terms: uninformed
2. [ adjective ] having little or no knowledge of
Synonyms: unfamiliar_with unacquainted
Examples:

"unacquainted with city ways"

Related terms: unfamiliar