I deeply regret the unintended consequences of my actions.
C2Expressing regret for unforeseen negative outcomes.
Please forgive my lapse in judgment.
C2Asking for forgiveness for a poor decision.
I understand your disappointment and want to make amends.
C2Acknowledging the other person's disappointment and expressing a desire to rectify the situation.
I offer my profound apologies for any inconvenience caused.
C2A formal apology for any trouble or difficulty caused.