impenitent

The adjective is derived from Late Middle English impenitent (“not penitent, unrepentant”), from Latin impaenitentem, the accusative feminine or masculine singular of impaenitēns (“unrepentant”), from im- (a variant of in- (prefix meaning ‘not’) + paenitēns (“contrite, penitent, regretting, repenting”) (the present active participle of paeniteō (“to be sorry, regret; to cause to repent; to repent”), from Proto-Indo-European *peh₁- (“to hate; to hurt”)). By surface analysis, im- + penitent. The noun is derived from the adjective.