tricky
adj (-ier, -iest)
(a) (of work, etc) requiring skill or tact （指工作等）需要技巧或智谋的
a tricky situation, problem, decision 需慎重对待的情况、 需慎重处理的问题、 需慎重做出的决定.
(b) (of people or their actions) crafty; deceptive （指人及人的行为）诡计多端的, 欺骗的
He's a tricky fellow to do business with. 他诡计多端难以共事.