impenitent

[L. impaenitens; pref. im- not + paenitens penitens: cf. F. impénitent. See Penitent.]
Not penitent; not repenting of sin; not contrite; of a hard heart. «They . . . died impenitent.» Milton. «A careless and impenitent heart.» Bp. Hall.

Im·pen·i·tent
n.

One who is not penitent. [R.]