unfamiliar

adjective
1
that you do not know or recognize
ناشناخته, نا آشنا, غیر آشنا, ناآشنا, غریب, نامأنوس
2
not having any knowledge or experience of something
غیر آشنا, ناآشنا, نامأنوس
an introductory course for students who are unfamiliar with computers
We were quite unfamiliar with the town.