fēn​fēn HSK4

one after another

纷纷 (紛紛) fēn​fēn
one after another adverb
happening in succession or one after another

After the performance, the audience members filed out of the theater one by one.

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

The autumn wind blows, and withered leaves fall from the trees one after another.

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

There has been much discussion and debate about this new regulation.

Frequency

Movie subtitles
2.12 per million appears in 1% of films
Written text
74.2 per million

Details

HSK 2.0
Level 5
HSK 3.0
Level 4

Sources

Definitions
CC-CEDICT