不，我不懂。

No, I don't understand.

Source: Tatoeba

Sentence Composition

1 不 bù
  1. no; not so
  2. (bound form) not; un-
2 我 wǒ
  1. I
  2. me
  3. my
3 不懂 bùdǒng
  1. (as a verbal complement) unable to comprehend (when seeing, hearing, etc.); cannot
  2. to not understand
  3. unable to comprehend (when seeing, hearing, etc.); cannot