tricky

这是一个没有简单答案的棘手决定。

It was a ___tricky decision with no easy answers.

没有地图在城市里找路可能会很棘手。

Navigating the city without a map can be ___tricky.

谈判的最后阶段是最棘手的。

The final stage of the negotiation is the most ___tricky.