With hindsight, I wish I had...
C1Expressing regret in retrospect.
Looking back, I should have...
C1Similar to 'With hindsight...', focusing on reflection.
I'm truly sorry for the oversight.
C1Expressing regret for a mistake or omission.
I feel terrible about...
C1Expressing strong feelings of regret.
It grieves me to say...
C1Expressing sorrow and regret formally.
I sincerely apologize for...
C1Expressing a genuine apology.
I regret to inform you that...
C1Formally conveying bad news with regret.
Please accept my sincerest apologies.
C1Offering a formal and heartfelt apology.
I take full responsibility for...
C1Accepting blame without making excuses.
I am profoundly sorry.
C1Expressing very deep regret.
I wish I could turn back the clock.
C1Expressing a desire to undo past actions.
I feel a deep sense of regret.
C1Expressing a strong feeling of sorrow and remorse.
My only regret is...
C1Highlighting a specific aspect of regret.
I'm consumed by guilt over...
C1Expressing overwhelming feelings of guilt and regret.
I carry the weight of this...
C1Expressing the burden of regret.
I should have foreseen...
C1Expressing regret for a lack of foresight.
In retrospect, I realize...
C1Reflecting on past events with regretful understanding.
The error of my ways...
C1Acknowledging past mistakes with regret.
I deeply regret my actions.
C2Expressing profound remorse for one's behavior.
With the benefit of hindsight...
C2Expressing regret about a past decision, implying a better understanding now.
I have cause to rue the day...
C2Expressing strong regret about a past event.
It grieves me to say...
C2Expressing sadness and regret about having to deliver bad news.
I'm kicking myself for...
C2Expressing self-reproach for a mistake.
I should have known better.
C2Expressing regret for a lack of foresight.