肆無忌憚

sìwújìdàn

unbridled; unscrupulous; impertinent

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si4 wu2 ji4 dan4

absolutely unrestrained, unbridled, without the slightest scruple

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肆無忌憚|肆无忌惮 [sì wú jì dàn] ► absolutely unrestrained ► unbridled ► without the slightest scruple