Loathsomeness

Origin

From loathsome + -ness.

Full definition of loathsomeness

Noun

1. The property or nature that gives rise to revulsion, that inspires loathing.
• 1813, Percy Bysshe Shelley, Queen Mab, I:Must putrefaction’s breath
  Leave nothing of this heavenly sight
  But loathsomeness and ruin?