うんうん

interjection

uh-huh; mm-hmm

Casual interjection used to show agreement or that one is listening, often repeated.

• 「明日あしたまでに終おわる？」「うんうん、大だい丈じょう夫ぶ。」

  "Can you finish by tomorrow?" "Uh-huh, no problem."

adverb, adverb taking the 'to' particle

with a moan; with a groan

Adverb describing a groaning or moaning sound, often used with と.

• 彼かれはうんうんとうなった。

  He groaned with a moan.