1. burdensome; expensive, costly; troublesome, severe, oppressive ...1380 obs.
2. of the nature of a load; onerous, heavy ...a1382 obs.
from Anglo-Norman chargeous, -jous = Old French chargeus, from Romance type cargoso, from carga (charge) + -ous
FIRST DOCUMENTED USE
1380 - see EXAMPLE below
"... Suppose we þat þes newe ordris, stondinge alle þes olde ordris, ben chargious to þe Chirche in worldli goodis þat þei dispenden. For noumbre of preestis brouȝt in bi Crist was sufficient for Cristis hous, and for þe same hous ben now moo and worse..."
From: Select Works of John Wyclif