enormity (n.) Look up enormity at Dictionary.com
late 15c., "transgression, crime, irregularity," from Old French énormité "extravagance, enormity, atrocity, heinous sin," from Latin enormitatem (nominative enormitas) "hugeness, vastness, irregularity," from enormis (see enormous). Meaning "extreme wickedness" in English attested from 1560s; sense of "hugeness" (1765) is etymological but to prevent misunderstanding probably best avoided in favor of enormousness, though this, too, originally meant "immeasurable wickedness" (1718) and didn't start to mean "hugeness" until c.1800.