The phrase "inhumane act" refers to a cruel or unkind action that goes against compassion, decency, or basic human values. It describes behavior that is unjust, harsh, or lacking empathy towards others. Full definition
But along with the probing of terrorists» psyches, responsible government officials must also use and be prepared to use force against those whose willingness to commit inhumane acts is announced and well known. (firstthings.com)
(h) «The crime of apartheid» means inhumane acts of a character similar to those referred to in paragraph 1 [crimes against humanity], committed in the context of an institutionalized regime of systematic oppression and domination by one racial group over any other racial group or groups and committed with the intention of maintaining that regime; (slaw.ca)
According to the definition in article 7 of the widely accepted Rome Statute of the International Criminal Court crimes against humanity are murder; extermination; torture; rape; political, racial, or religious persecution and other inhumane acts if they are part of a widespread or systematic practice (21). (globaleducationmagazine.com)