apologetic
adj. 道歉的，愧疚的；（为理论或宗教教义）辩护的，辩解的
例句
'Sorry,' she said, with an apologetic smile.
“对不起。”她说，歉然一笑。
《牛津词典》
They were very apologetic about the trouble they'd caused.
他们对所惹的麻烦深感愧疚。
He opened the rear door for me with an apologetic tilt of his head.
他歉疚地歪着头为我打开了后门。
《柯林斯英汉双解大词典》
