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The original meanings that enormity carried related to great wickedness, and some assert that enormity should today only be used with such meanings, and that enormousness is the proper word to use to mean "large size." Despite these claims, enormity frequently refers to large size, either literal or figurative, though it usually suggests something so large as to seem overwhelming.

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- great magnitude/size/scale of something - wickedness, evil, atrocity

Purists insist on the second meaning only, and will perhaps suggest you swap with ‘enormousness’ instead.