nefariousness

历史学家在书中记录了该政权令人发指的邪恶行径。

The historian documented the regime's ___nefariousness in chilling detail.

村民们都害怕山洞里那股无法解释的邪气。

The villagers feared the unexplained ___nefariousness lurking in the cave.

侦探对罪犯极度邪恶的震惊几乎让调查中断。

The detective's shock at the criminal's ___nefariousness nearly halted the investigation.