unfamiliar

unfamiliar
adjective

not known or recognized
不熟悉的；陌生的
his voice was unfamiliar to her.
他的声音对她来说很陌生。
■unusual or uncharacteristic
不常见的；奇异的
the yellow taxicab was an unfamiliar sight on these roads.
黄色的出租车在这些马路上不常见。
[ predic.](unfamiliar with)not having knowledge or experience of
不熟悉的；不通晓的
the organization was set up to advise people who might be unfamiliar with legal procedures.
该机构的建立是为不熟悉法律程序者提供咨询。

派生
unfamiliarity
noun