barbarity vs barbarousness

barbarity and barbarousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
barbarity	Yes	No	No	No
barbarousness	Yes	No	No	No

As nouns, barbarity and barbarousness are synonyms defined as:

barbarity and barbarousness: the quality of being shockingly cruel and inhumane

Other synonyms of barbarity include atrociousness, atrocity, heinousness.

barbarity (noun)	barbarousness (noun)
a brutal barbarous savage act	the quality of being shockingly cruel and inhumane
the quality of being shockingly cruel and inhumane