guiltily       
adverb uk/ˈɡɪl.təl.i/ us/ˈɡɪl.təl.i/
 有负罪感地,内疚地
in a way that shows that you feel guilty
  "I don't know where your money is!" she exclaimed guiltily. “我不知道你的钱在哪里!”她愧疚地叫道。 
 He hesitated, then guiltily took another biscuit off the plate. 他犹豫了一下,然后不好意思地又从盘子里又拿了一块饼干。 
 See: guilty
 - More examples
 - She felt guiltily pleased about that piece of news.
 - Claudia jumped guiltily at the sound of his voice so close behind her.
 - She thought guiltily of the money she had been spending on new clothes.