Not familiar or acquainted with another.

not knowledgeable about something specified; "American tourists wholly innocent of French"; "a person unacquainted with our customs"[syn: innocent ]

having little or no knowledge of; "unacquainted with city ways"

Not usual; unfamiliar; strange. [Obs.]

adjective

innocent , oblivious , unaware , unconscious , unenlightened , unfamiliar , uninformed , unknowing , unwitting , ignorant , inexperienced , strange , unadorned , unknown