露つゆ知しらず

expression, adverb

not knowing at all; completely unaware; without the slightest idea

Used in negative contexts to emphasize total lack of knowledge or awareness. Often appears with verbs like 思う, 考える, or 知る in negative form.

• 彼かれがそんなことを考かんがえているとは露つゆ知しらずだった。

  I had no idea at all that he was thinking such a thing.

• それが最さい後ごの会かい話わになるとは露つゆ知しらず、いつも通どおり別わかれた。

  We parted as usual, completely unaware that it would be our last conversation.