恐縮
kyoushukufeeling (much) obligednounsuru-noun
Example sentences1
お忙しいところ恐縮ですが、ご確認をお願いします。
oisogashii tokoro kyoushuku desu ga, go kakunin o onegai shimasu.
I am sorry to trouble you when you are busy, but please could you check this. formal