inhumanity n.

"barbarous cruelty," late 15c., from French inhumanité (14c.) or directly from Latin inhumanitatem (nominative inhumanitas) "inhuman conduct, savageness; incivility, rudeness," noun of quality from inhumanus "inhuman, savage, cruel" (see inhuman).

And Man, whose heav'n-erected face

The smiles of love adorn,—

Man's inhumanity to man

Makes countless thousands mourn!

[Robert Burns, "Man was Made to Mourn," 1784]