IPA: /ˈbɑːrbəˌrɪzəm/
KK: /ˈbɑːrbəˌrɪzəm/
A practice or behavior that is considered crude, uncivilized, or lacking in culture and refinement.
The invasion was marked by acts of barbarism that shocked the civilized world.
Barbarism is formed from "barbarus" (from Latin, meaning foreign or strange) and the suffix "-ism" (meaning a practice or belief). The term originally referred to the practices or beliefs of those considered foreign or uncivilized.
Think of 'foreign' or 'strange' ('barbarus') practices or beliefs, which helps you remember that 'barbarism' refers to uncivilized behavior.