Inhumanity is cruel treatment of other people. Man's inhumanity to man, acts of inhumanity, sheer inhumanity.
Man's inhumanity to man is the fixed phrase and comes from a poem by Burns. The word rests on the idea that cruelty is a departure from being human, which is a claim about human nature as much as a description.
1nouninhumanityCruel treatment of other people.
“The report described the inhumanity of the prison, where prisoners were beaten and starved.”
inhumanity is a cruelty.
Latin inhumanitas is in-, not, plus humanitas, from humanus, human.
Latin
inhumanitas
Middle French
inhumanité
English, today
inhumanity
From Middle French inhumanité, from Latin inhumanitas, equivalent to inhuman + ity.
Etymology from Wiktionary, CC BY-SA