Wiktionary
regretless
a. Having no regrets.
Usage examples of "regretless".
On his family, and on the surrounding scene, he looked with tempered pleasure and benevolent satisfaction, while his son exhibited the gay spirits of youth, anticipating new delights, and regretless of those, that were passed.
Five-Man Room had shed his electrified muscle-shirt and was showing off his tattoos in a boneheaded regretless first-category fashion to Ken Erdedy while R.