肆無忌憚

Simplified: 肆无忌惮

On the HSK 7-9 vocabulary list, at CEFR level C1.

sìwújìdàn ㄙˋ ㄨˊ ㄐㄧˋ ㄉㄢˋ

    • absolutely unrestrained
    • unbridled
    • without the slightest scruple

Character by character

Sources