Here is a sample template you can use to write an apology letter to your boss.
Subject: Apology for [reason for apology]
Please accept my sincere apologies for my recent actions and behavior that caused major inconveniences.
I admit that I was wrong, and my actions could’ve led to irreparable consequences if you wouldn’t have intervened in time. I deeply regret letting you down on this [project/task], and I promise to work more diligently and carefully onwards.
I hope that you will accept my sincere apologies and give me a chance to rectify my mistakes. From here on, I commit to working harder and performing to the best of my capabilities with utmost dedication and caution.
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