Merriam-Webster Online Dictionary
penitent (adjective)feeling or expressing humble or regretful pain or sorrow for sins or offenses - repentant
1.
a person who repents of sin
2.
a person under church censure but admitted to penance or reconciliation especially under the direction of a confessor
Merriam-Webster Online Thesaurus
penitent (adjective)feeling sorrow for a wrong that one has done
SYNONIMS:
apologetic, compunctious, penitent, regretful, remorseful, repentant, rueful, sorryRELATED WORDS:
ashamed, shamefaced, sheepish; dolorous, grieving, lugubrious, mournful, plaintive, sorrowful, wailing, weeping, woefulNEAR ANTONYMS:
compassionless, cruel, merciless, pitiless, ruthless, unmerciful; shameless, unashamed