I'll do my best.

[robvalue]

I hate that also. I was given a bunch of work one time, and told it needed completing that day. I said I'd do my best. She said, "No, you won't do your best, you'll get it done."

I repeated that no, I'll do my best. I had to answer phones there as well, and we never knew how many calls we'd get. She got all pissy and kept insisting I will get it done.

She was a twat. It amounts to making you promise something you can't guarantee. I don't like doing that.