This figure is reached by a fiendishly clever equation.这一数字是通过一个极为精妙的方程式计算出来的。America's trade laws are fiendishly complex.美国的贸易法极为复杂。She spent the morning tackling a fiendishly difficult crossword.她上午在做一个极难的纵横填字游戏。The world of finance is fiendishly complicated.金融界极度复杂。