enormity
Enormity is a noun with two primary senses. It can denote the great size or extent of something, but it is also commonly used to describe the extreme seriousness or wickedness of an act. The word derives from Old French enormité and Latin enormitas, originally signaling vastness before developing the moral connotation that dominates contemporary usage.
Usage concerns: In contemporary writing, many style guides recommend reserving the sense of extreme moral gravity
Related terms and nuance: The noun “monstrosity” overlaps with the moral sense of enormity, while “enormous”