adverb · happening in succession or one after another

演出结束后，观众纷纷走出了剧场。

adverb · numerous and easily scattered, often describing things falling through the air like snow or petals

秋风吹过，枯叶纷纷从树上飘落下来。

idiom · diverse, numerous and confused, or pell-mell (often describing opinions, discussions, or states of mind)

对于这个新规定，人们议论纷纷。