Antonyms of adj impenitent

2 senses of impenitent

Sense 1
impenitent (vs. penitent), unrepentant (vs. repentant), unremorseful -- (not penitent or remorseful)

penitent (vs. impenitent), repentant (vs. unrepentant) -- (feeling or expressing remorse for misdeeds)
        => contrite, remorseful, rueful, ruthful -- (feeling or expressing pain or sorrow for sins or offenses)
        => penitential, penitentiary -- (showing or constituting penance; "penitential tears"; "wrote a penitential letter apologizing for her hasty words")

Sense 2
impenitent -- (impervious to moral persuasion)

INDIRECT (VIA unregenerate) -> regenerate -- (reformed spiritually or morally; "a regenerate sinner"; "regenerate by redemption from error or decay")

Similarity of adj impenitent

2 senses of impenitent

Sense 1
impenitent (vs. penitent), unrepentant (vs. repentant), unremorseful -- (not penitent or remorseful)
          Also See-> unashamed#1; unregenerate#2, unregenerated#1

Sense 2
impenitent -- (impervious to moral persuasion)
       => unregenerate (vs. regenerate), unregenerated -- (not reformed morally or spiritually; "unregenerate human nature"; "unregenerate conservatism")