うん

うん, ウン, うむ, ううむ, う~ん, うんっ, ウ〜ンun

interjection

  1. yes
  2. yeah
  3. uh huh
  4. hum
  5. hmmm
  6. well
  7. erm
  8. huh?

Study it in Yanamino

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences