sì​wú​jì​dàn

unrestrained

肆无忌惮 (肆無忌憚) sì​wú​jì​dàn
unrestrained idiom
acting without any restraint, fear, or moral scruples; absolutely unbridled and brazen

He shouted loudly in public without restraint, completely disregarding others.

Frequency

Movie subtitles
1.01 per million appears in 1% of films
Written text
3.75 per million

Details

HSK 2.0
Level 6

Sources

Definitions
CC-CEDICT