1、sad的副词sadly.
2、adv.令人遗憾; 不幸地; 悲伤地; 伤心地; 极为; 苦苦地;
3、[例句]Sadly, both he and my mother died of cancer.非常不幸的是,他和我母亲都死于癌症。
4、[其他]比较级:more sadly 最高级:most sadly.