inhumanity; inhuman nature
Abstract noun referring to the quality of being inhumane or lacking compassion; often used in discussions of ethics, war, or systemic cruelty.
They denounce the inhumanity of war.
The inhuman nature of the policy was criticized.
Adjectival form meaning 'inhumane' or 'inhuman'; 非人道性 is the noun form referring to the quality or nature of being inhumane.
Compound of 非 (hi-, 'non-'), 人道 (jindō, 'humanity'), and 性 (-sei, '-ness'). The exact historical derivation is uncertain, but the word follows a common pattern for abstract nouns.