guilty
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.

SMART Vocabulary: related words and phrases

Ashamed and embarrassed
abash
abashed
ashamed
awkward
awkwardly
guiltiness
hangdog
have egg on your faceidiom
humbling
humblingly
mortify
mortifying
not know where to put yourselfidiom
pride
self-mortification
sheepishness
silly
smallness
squirm
swallow your prideidiom