also: うむ · ううむ
Casual affirmative interjection, like nodding 'yeah' or 'uh-huh'. Used in informal conversation to show agreement or that you are listening.
"Want to go to a movie tomorrow?" "Yeah, sure."
うん、それでいいと思う。
Yeah, I think that's fine.
Hesitation or thinking sound, like 'hmm' or 'well...'. Used when pausing to consider something or when slightly unsure.
うーん、ちょっと難しい質問だな。
Hmm, that's a tough question.
「これで大丈夫かな？」「うん…もう少し考えたほうがいいかも。」
"Is this okay?" "Well... maybe we should think about it a bit more."
Only with reading うん
A groan or grunt of pain or effort. Restricted to the reading うん.
うん…腰が痛い。
Oof... my back hurts.