noun
contrition
kuhn-TRISH-uhn/kənˈtrɪʃn/
Deep remorse for wrongdoing.
The person's bowed head and apologetic gesture express contrition while returning the borrowed object.

Etymology
Contrition names a grinding or crushing, used figuratively in Christianity for brokenness of spirit over sin. That inward crushing became sincere remorse, including a resolve not to repeat the wrong.
In context
then said my act of contrition praying by rote for forgiveness I used what little energy I had left to finish that prayer
More examples
- The judge doubts the sincerity of his contrition.
- She writes a letter of contrition to her sister.
- His apology sounds polished, but it reveals no real contrition.
Forms
contrite adjective — Deeply remorseful about having done wrong.
Similar words
- remorse
- Nearly interchangeable, but less formal and less associated with religion.
- guilt
- Can mean responsibility for wrongdoing, not just sorrow about it.
- repentance
- Emphasizes turning away from wrongdoing as well as regretting it.