绵里藏针

绵：丝棉。棉絮里面藏着针。形容柔中有刚。也比喻外貌和善，内心刻毒。

元·石君宝《曲江柳》第二折：“笑里刀剐皮割肉，绵里针剔髓挑筋。”

偏正式；作谓语、定语、状语；

(1) [ruthless character behind a gentle appearance is like a needle hidden in silk floss]