John: 'This delay is unacceptable.'
My sincerest apologies; I understand your frustration.
C2Meaning
Expressing apology and acknowledging the recipient's negative emotions.
Example sentences
Alice: 'My sincerest apologies; I understand your frustration. We are working to rectify the situation immediately.'
John: 'My sincerest apologies; I understand your frustration. I take full responsibility.'
Alice: 'I'm extremely disappointed with the outcome.'