penitent
adjective
°Feeling pain or sorrow on account of sins or offenses; repentant; contrite; sincerely affected by a sense of guilt, and resolved on amendment of life.
°Doing penance.
noun
°One who repents of sin; one sorrowful on account of his transgressions.
°One under church censure, but admitted to penance; one undergoing penance.
synonyms: penaunt