Brutality
Noun and な adjective
ざんぎゃく
これは非常に残虐な犯行です。
This is an extremely brutal crime.
The remainder of oppression is cruelty. Even when you're done oppressing people the brutality you caused will linger in their minds and hearts.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.