애달파요 · 애달팠어요 · 애달픈 (+noun) (ㅡ drops)
to be heartrending, poignant, achingly sad
Example
떠난 사람을 그리워하는 노래가 애달파요.
The song longing for someone who left is heartbreaking.
Word parts
Probably from 애 'insides, heart' (as in 애타다) + 닳다 'wear away': heart-wearing sadness.