regretfully

adv

1. In a regretful manner, with regret.

   “The steak and chips partaken of for lunch seemed now to belong to another decade. He regretfully recognized the fact that he would not make a success of a hunger strike.”

   “So after learning a great deal about iron founding and much more about pike fishing, one regretfully took leave of a shop full of kindly characters and proceeded to a worse lot of odours in the brass foundry.”

   “To that end he had sent his men among the common folk of the town, from whom came a litany of tales that led Hawk to a stunningly wrong conclusion. "It seems I may not be good enough at listening," he said regretfully.”

2. (proscribed)Unfortunately, in a manner inspiring or deserving regret; used only as a sentence adverb (to introduce and modify an entire sentence).