expression · describing music, literature, or art that is lingeringly sentimental and deeply touching

这首曲子的旋律缠绵悱恻，诉说着无尽的哀愁。

idiom · describing a person who is deeply moved and sad beyond words, often regarding deep affection or hidden grief

他由于思念故友，这几日总是显得缠绵悱恻。