unfamiliar /ˌʌnfəˈmɪljɚ/ adjective Learner's definition of UNFAMILIAR
[more unfamiliar; most unfamiliar]
: not frequently seen, heard, or experienced不熟悉的；不常见的；陌生的 -
He gets nervous when he is in unfamiliar surroundings.在陌生的环境中他感到紧张。
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an unfamiliar face/place陌生的面孔/地方
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The book is full of unfamiliar words.这部书里尽是不常见的单词。
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often + to
unfamiliar with (something)
: not having any knowledge of something不熟知的；不懂的 — unfamiliarity
/ˌʌnfəˌmɪlˈjerəti/ noun [noncount]