penitently       
adverb  formal uk/ˈpen.ɪ.tənt.li/ us/ˈpen.ə.tənt.li/
 懊悔地,愧疚地
in a way that shows that you are sorry for something you have done because you feel it was wrong
  He dropped his eyes penitently to the carpet.  他愧疚地垂下眼睛看着地毯。 
 "I'm sorry, too," I said penitently. “我也很抱歉,”我懊悔地说。 
 See: penitent
 - More examples
 - She penitently confessed to the crime.
 - His eyes were fixed penitently on his boots.
 - Kelly penitently asked forgiveness.