from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The state or quality of being atrabilarious.
from The Century Dictionary and Cyclopedia
- n. The state or quality of being atrabilious or melancholy.
From Latin ātra bīlis ("black bile"). (Wiktionary)
Old Nick probably did not come off because at the moment he was an atrabilarian suffering acutely from black bile or black choler, and his atrabilariousness was making him woefully chumpish.