c. 1200, "liberally, generously, bountifully;" also "in large measure; abundantly," from large + -ly (2). Meaning "extensively, to a great extent" is c. 1400.
These accounts are largely inactive
the sketch was so largely drawn that you could see it from the back row
larder
lardy
Lares
larf
large
largely
large-mouth
largeness
larger
large-scale
largesse