Regrettably

Regrettably, we have not received your reply.

Regrettably, this self-centered behavior is absorbed by their children.

Very regrettably, 1,900 square meters of land become desert every second.

Regrettably, I cannot agree with you.

Regrettably, he lacks the financial wherewithal to run a presidential campaign.

Regrettably, we aren't familiar with the rest of her works.

Regrettably, that didn't happen.

I like to inquire into everything. Hercule Poirot is a good dog. The good dog follows the scent, and if, regrettably, there is no scent to follow, he noses around — seeking always something that is not very nice.

Regrettably!

Regrettably, mass shootings of children now occur so frequently in United States schools that some parents are buying so-called bulletproof backpacks for their children. While the backpacks can stop a bullet fired from a handgun, they are ineffective against semi-automatic rifles, which ruthless shooters can easily purchase in that country.

Your exam results are regrettably poor: you should regretfully reflect on all the time wasted reading comics.