fiendishness

uncountable usually

The quality of being fiendish.

Japanese Meaning

悪魔的な性質や、邪悪・凶悪な性質を持つこと / 極めて非道で残忍な状態や性格

The detective was unnerved by the criminal's fiendishness during the interrogation.

刑事は尋問中、犯人の悪魔的な性質にぞっとした。

Sense（1）

The quality of being fiendish.

He added, “I didn’t give enough credit to the fiendishness of the C.I.A.”

fiendishnesses

（ plural ）