他以巧妙的手法说服了对方，既达到了目的又不露痕迹。

He persuaded the other party with such ___artfulness that he achieved his goal without leaving any trace.

这幅画的巧妙之处在于用简单的线条表达了复杂的情感。

The ___artfulness of the painting lies in its ability to express complex emotions with simple strokes.