Definition of bigly:
(adj) :
(nonstandard, humorous) Big league.
(adv) :
(now rare) In a big way, greatly; to a great extent, on a large scale.
(adv) :
(now rare) Strongly, with great force.
(adv) :
(now rare) In a blustering or boastful manner; haughtily, pompously.
(adj) :
(Scotland, now obsolete elsewhere) Habitable, liveable; hence delightful, pleasant, pleasing.