装作若无其事原来才是最狠的报复英语翻译

Set up for as if nothing has occurred is the most malicious revenge

Pretending to be as if nothing happened is the shrewdest way( 或the most malicious way) of revenge indeed.

shrewd,精明的
malicious, 恶毒的,怀有恶意的

这两种说法的用词看具体语境.