regret

I regret talking back, not listening to Mom.

and I regret not saying anything.

Yes, thank you very much. You won't regret it!

I regret eating so many donuts now.

On Tom's face was a look of regret but in his heart, he was satisfied.

I regret talking back, not listening to Mom.

How do the speakers express regrets and give responses?

It is with great regret that I must decline your offer.

Don’t do anything you might regret.

We regret any inconvenience caused to our customers.

Larry said he had no regrets about retiring.