IPA: /rɪˈpɛntəntli/
KK: /rɪˈpɛntəntli/
In a way that shows you are sorry for something you have done wrong.
He looked at her repentantly after forgetting their anniversary.
Repentantly → It is formed from "repent" (from Latin "paenitere", meaning to feel regret or sorrow) and "-ly" (a suffix used to form adverbs). The word "repentantly" means in a manner that expresses regret or sorrow for one's actions.
Think of feeling regret ('repent') and how you express that feeling in a certain way ('-ly'). This helps you remember that 'repentantly' describes acting with regret.