ETYMOLOGY
from Latin agilis (agile) + -ous
EXAMPLE
“…What is become of all these iugling gambalds, Apish deuises, with all the rest of your squint-eyed trickes? when as through your deepe studies, long practises, & apt bodies, both strong & agilious, you haue attained to the height of all these things. …”
From: Paradoxes of Defence wherein is proued the true grounds of fight to be in the short auncient weapons, and that the short sword hath aduantage of the long sword or long rapier
By George Silver, 1599
Lexicophilia 