ぬ
(Nu)
Formal or archaic negative suffix for verbs, equivalent to the modern 'nai'.
Connection rules
- +Verb (ない-stem) + ぬ
- +する becomes せぬ
Examples
1.
思わぬところで先生に会った。

Omowa nu tokoro de sensei ni a ta.
I met my teacher in an unexpected place.
「Surprise meeting」
2.
知らぬ間に雨が降り始めていた。

Shira nu ma ni ame ga furi hajime te i ta.
It had started raining before I knew it.
「Looking out the window」
Practice
Before I knew it (unawares), the sun had already set.
___、もう日が暮れていた。
Romaji also accepted