Enormity does not mean great size, it means more like great evil. I gave up the fight for this word because with even the BBC misusing it, I was never going to win. Now both meanings appear in the dictionary. What can you do? Most people who are conflating two things don't care, so they are always going to say "huh. Why so you care so much?" In my case, that only has boring potential answers, but in your case it has an easy answer few are unmoved by, so I would drop the fight for the original meaning of words when society has moved on if I were you.
Linguists define the meaning of a word from its use. You can't prevent language change as an individual, and this one is always going to get interpreted a particular way. Give up. Already dictionaries literally list figuratively as a meaning for literally. It's not going to work and it's not worth your time.