adv

• (now rare) In a big way, greatly; to a great extent, on a large scale.
  "He looked at Mrs. Harling, who loomed bigly in the dull light."
• (now rare) Strongly, with great force.
  "Thesse men did much in order to publicke good, befor they spake biglie; bot done nothing since, saue that they haue drawin away considerable forces, raissed at wast charges for the publicke defence."
• (now rare) In a blustering or boastful manner; haughtily, pompously.
  "Would'ſt thou not rather chooſe a ſmall renown, / To be the mayor of ſome poor paltry town, / Bigly to look, and barbarouſly to ſpeak; / To pound falſe weights, and ſcanty meaſures break?"

adj

• (nonstandard, humorous) Big league.
  "It had been the very bestest of bigly weekends. Two rounds of golf at his very own course in Turnberry."

adj

• (Scotland, now obsolete elsewhere) Habitable, liveable; hence delightful, pleasant, pleasing.
  ""And steek it weel, thy biglie bower, / And by the rood thee sain; / And tell thy bedes in haly guise, / Till this ae night is gane!""