Yabancı dillerle yabancı olursan, yabancının sessizliğini asla anlayamazsın. - Being unfamiliar with foreign languages, you'll never be able to understand the foreigner's silence.
Ben bu terime yabancıyım. - I'm unfamiliar with that term.
If something is unfamiliar to you, you know nothing or very little about it, because you have not seen or experienced it before. She grew many wonderful plants that were unfamiliar to me I was alone in an unfamiliar city. familiar + unfamiliarity un·fa·mili·ar·ity problems which arise from the newness of the approach and its unfamiliarity to prisoners. familiarity
If you are unfamiliar with something, it is unfamiliar to you. She speaks no Japanese and is unfamiliar with Japanese culture. + unfamiliarity un·fa·mili·ar·ity her unfamiliarity with the politics of the region