unfamiliar
adj
1 ~ (to sb) not well known 不熟悉的
His face was unfamiliar to me. 我觉得他很面生.
working in new and unfamiliar surroundings 在不熟悉的新环境中工作.
2 [pred 作表语]
~ with sth (fml 文) not having knowledge of sth; not acquainted with sth 对某事物不了解或不熟悉
I´m unfamiliar with this type of computer. 我不熟悉这种类型的计算机.