ˋˊㄐㄧˋㄉㄢˋsìwújìdàn

肆无忌惮
  1. 恣意妄為毫無顧忌 父親肆無忌憚為所欲為」。

absolutely unrestrained, unbridled, without the slightest scruple
sans aucun scrupule, sans aucune retenue, sans vergogne, effrontément, impudemment
rücksichtslos (Adj)​, skrupellos (Adj)​, ohne jede Scham und Scheu