In a buckish manner; in the affected, showy, or rakish style of a fashionable young man.
From 'buckish' + '-ly' (adverbial suffix). This forms the adverbial form to describe how someone acts or dresses in that affected, ostentatious way.
This word captures a whole social attitude—imagine someone swaggering into a room in the 1600s dressed in ridiculously fancy clothes, that's buckishly! It's like 'flashily' but with more historical attitude.
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