luàn​lái

act recklessly

乱来 (亂來) luàn​lái
act recklessly adverb
to act in a foolish, arbitrary, or careless way without following proper procedures or logic

This is a highly professional job; you must not mess around.

misbehave adverb
to behave in an improper, irresponsible, or immoral manner

He ruined his reputation because he was fooling around with people outside.

Frequency

Movie subtitles
5.22 per million appears in 2% of films
Written text
1.41 per million

Sources

Definitions
CC-CEDICT