Moyo mukukutu ((hardhearted; hardness of heart) zvinoreva kuwomesa moyo, imwe nguva zvichiwonekwa nekuita hutsinye, humhondi, huroyi, kushusha, kusaregerera, kunyima kana dzimwe tsika dzisina kururama. Kuwomesa moyo (being hard hearted). Herero vanoti ou-kukutu u'omutima (n. impenitence) kureva moyo mukukutu. Mamwe mazwi: N'omutima omukukutu (v. impenitent).