Dear {Name},
I feel like the proverbial sloth. I'm so sorry I've been lazy. I know that it was my responsibility to {task}. Instead, I lounged around, procrastinated, and did everything but the one thing I was supposed to do.
It's no laughing matter, I know. Rest assured (no pun intended) that I understand how my laziness impacted you personally. It won't happen again.
Sincerely,
{Name}
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