I was then totally unacquainted with his poems.

那时我完全不知道他的诗。

《柯林斯英汉双解大词典》

Tom was at sea—a Great Seal was something which he was totally unacquainted with.

汤姆很茫然——御玺这东西，他根本就不认识。

youdao

I am at an unfavourable position in being conversationally unacquainted with English.

我由于不熟悉英语会话而处于不利地位。

《新英汉大辞典》

For those unacquainted with the love life of the Australian prime minister, I am referring to Tim Mathieson, her long-term boyfriend who lives with her at The Lodge in Canberra.

BBC: The first bloke