Whats another word for no regrets

Another word for no regrets is impenitent.
Impenitent means to not have any regrets or feel any shame about one's attitude or actions.
Examples of impenitent in a sentence :
-The bully was impenitent when he pushed the little boy off the swings.
-Julie's impenitent attitude after reading Sara's diary in front of her whole class, led to detention from the Headmistress.

No frills is another word for no regrets. I hope this helped

Show his work so he doesn’t get points taken off. this is because even if he can do calculations in his head, he may make a mistake and having it on the paper will not only him find mistakes but show that he was doing the work as well.