The Collaborative International Dictionary of English v.0.48:

Bigly \Big"ly\, adv. [From Big, a.]
   In a tumid, swelling, blustering manner; haughtily;
   violently.
   [1913 Webster]

         He brawleth bigly.                       --Robynson
                                                  (More's
                                                  Utopia. )
   [1913 Webster]