Zhè zhǒng duìdài qiúfàn de fāngshì cǎnwúréndào, lìng rén zhènjīng.
This way of treating prisoners is brutally inhuman and shocking.
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usage
惨无人道 is a strong condemnation, used for extreme cruelty or atrocities. It is not used for minor rudeness or everyday unkindness — reserve it for genuinely shocking acts of brutality.