한스러워요 · 한스러웠어요 · 한스러운 (+noun) (ㅂ irregular)
to be deeply regrettable, full of sorrow and resentment
Example
어머니께 효도하지 못한 것이 한스러워요.
I deeply regret never having taken good care of my mother.
Word parts
한 resentment
한 'deep sorrow' + -스럽다 'feeling like': feeling full of han.