ETYMOLOGY
from Latin fācundia (eloquence) + -ous
EXAMPLE
“…Discrete and hardy and wonder vertuous,
And of speche ryght facundious.
And coud him wel in euery thinge demene,
But Menelay of stature was but meane…”
From: The Auncient Historie and Onely Trewe and Syncere Cronicle of the Warres Betwixte the Grecians and the Troyans
By John Lydgate, 1430
Lexicophilia 