However, he holds that ethics is not capable of proving cruelty—or happiness, for that matter—to be either good or bad. This view of the limitations of the reasoning of normative ethics belongs to metaethics.
Source: wiktionary
Metaethics
Synonyms for "metaethics"
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With respect to metaethics, some philosophers, known as cognitivists, believe that it is possible to identify objective criteria for determining what is ethically right or wrong, or good and bad. Others, however, question whether this is possible.
Source: wiktionary