This small drawback did not affect either the dance display or the horse show, which were both performed magnificently.

magnificently 是形容词 magnificent 的副词形式，由词根 magni-（表示"大、伟大"）和 -ficent（表示"做、产生"）组成，加上副词后缀 -ly。原词 magnificent 意思是"壮丽的、宏伟的"，副词形式表示"以壮观的方式、极其出色地"。