(a.) Vindicatory; defensory; justificative.

abject apologia ascetic atoning cleansing compensational compensatory compunctious conscience-stricken contrite defense excusatory excusing expiatory extenuating extenuative humble humbled justification justificatory justifying lustral lustrational lustrative melted palliative penitent penitential penitentiary piacular propitiatory purgative purgatorial purifying reclamatory recompensing redeeming redemptive redressing refuting regretful rehabilitative remorseful reparative reparatory repentant repenting restitutional restitutive restitutory righting rueful satisfactional sheepish softened sorry squaring touched vindicative vindicatory