Barbarianism Definition

noun

A primitive, less advanced, or simplistic ethos or societal condition; barbarism.

Some postulate that after a nuclear war, humanity would fall into a state of barbarianism.
Wiktionary

Behaviour appropriate to a barbarian, that is uncivilized, brutal, or crude.

The teacher accused the bullies of barbarianism when she caught them taunting the girl in a wheelchair.
Wiktionary