Phrases Handling Complaints and Apologies

I sincerely apologize.

B2

Meaning

I express my deepest regret.

Example sentences

John: 'I'm very disappointed.'

Alice: 'I sincerely apologize for the inconvenience this has caused.'

John: 'I sincerely apologize. We'll make sure this doesn't happen again.'

Alice: 'This is unacceptable.'