Wiktionary
swaggeringly
adv. In a swaggering way.
Usage examples of "swaggeringly".
When Schneider offered him coffeecake, brown with sugar and cinnamon and freshly rewarmed, he swaggeringly accepted it with his left hand, without asking to be relieved of the cup.
Both were hale, vigorous, physical peoples, both excelling in things material, both baffled by beauty, both swaggeringly confident that theirs was the ultimate ideology, both infantile and contentious, and both terribly dangerous.