Struttingly

By day her soul walked like a peacock on its green lawn, proudly, pompously, struttingly, because she was the mother of this gorgeous son. ❋ Rebecca West (1937)

They slackened speed before they came to the wharf, which just here by the station jutted out in a grey bastion surmounted by the minatory finger of a derrick, and some of them climbed out and put round baskets full of shining fish upon their heads, and, walking struttingly to brake their heavy boots on the slippery mud, followed a wet track up to the cinderpath. ❋ Rebecca West (1937)

Slowly and struttingly did the man of two virtues perform the whole pilgrimage of Oxford-street. ❋ Edward Bulwer Lytton Lytton (1838)

Thus, again we have Alex the teen-gang leader of four swaggering cohorts in crime (garage overalls and ballet pumps the uniform here), bile-filled, struttingly contemptuous of authority and environment, parents and surroundings, anything other than themselves. ❋ Unknown (2009)