noun
brutality; animal nature
Refers to the cruel, instinct-driven, or bestial side of human nature. Often used in literary or psychological contexts.
戦争は人間の獣性を露わにする。
War exposes the brutality of human nature.
彼の行動には獣性が感じられた。
There was a sense of animal nature in his actions.
Compound of 獣 (beast) and 性 (nature, character). The exact historical derivation is uncertain, but the word is used to describe the bestial or instinctual side of humans.