na-adjective, noun which may take the genitive case particle 'no', noun
Describes actions, treatment, or conditions that are morally wrong, cruel, or lacking humanity. Often used in strong negative judgments.
彼の非道な行いに怒りを感じた。
I felt anger at his unjust actions.
非道な扱いを受けたと訴えた。
They complained that they had been treated inhumanely.
Compound of 非 (hi, 'not, un-') and 道 (dō, 'way, path, morality'), literally 'not the way' or 'against the moral path'. The word has been used in Japanese to denote extreme injustice or inhumanity.