“Please accept my sincerest apologies” is a great formal synonym. You can use this to show that you regret having to disturb someone via email. If you have something important t… See more

“I’m sorry to disturb you” is a simple alternative you can use. It works well because it shows that you’ve thought about talking to other people, but you don’t think anyone els… See more

“I hope I’ve not caught you at a bad time” is a great phrase you can use in an email. It also works well when you’re speaking to someone because it shows that you recognize t… See more

“I understand your frustration” allows you to empathize with the recipient. It shows that a disturbance or inconvenience has occurred, and you’re doing everything you can to correct it. 1… See more