How to Say "repentance" in Spanish
The Spanish word for “repentance” is “arrepentimiento” — B1 level. This is a very common word in everyday Spanish.

Examples
Siento mucho arrepentimiento por haberle gritado.
I feel a lot of regret for having shouted at him.
Sus lágrimas eran una señal de arrepentimiento sincero.
Her tears were a sign of sincere remorse.
Él no mostró ningún arrepentimiento ante el juez.
He didn't show any regret before the judge.
Masculine Ending
This word ends in '-miento', which is a very common way to turn a verb into a noun. Almost all words ending in '-miento' are masculine, so you will always use 'el' or 'un'.
Noun vs. Verb
Use 'arrepentimiento' when you want to name the feeling itself. If you want to say 'I regret,' you need the action word: 'Me arrepiento'.
Confusing with 'remordimiento'
Mistake: “Using 'remordimiento' to mean a simple change of mind.”
Correction: Use 'arrepentimiento' for general regret. 'Remordimiento' is much heavier and implies a deep, painful 'stinging' of the conscience.
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