すみません、よく分かりません。
Sumimasen, yoku wakarimasen.
Sorry, I don’t quite understand.
- Word for word
- “Sorry, I don’t understand well.”
- Politeness: Polite
- です/ます style. The safe default with strangers, shop staff and colleagues.
- When you would say it
- When you cannot follow.
- Worth knowing
- よく is “well”: it softens the sentence. Plain 分かりません is blunter.