trickier
adj.
狡猾的( tricky的比较级 );
（形势、工作等）复杂的;
机警的;
微妙的;
例句:
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On the instrumental side, things get even trickier.
来自BBC
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Imposing speed restrictions is easy, but forcing motorists to observe them is trickier.
限制车速容易，但强制司机遵守这些限速规定就难办多了。
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This is the general rule, but some cases are trickier than others.
以上是一般规则, 但某些案例会比别的案例更为棘手.
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The lower the numbers go, the trickier the problems get.
武器的数量越低, 问题就越复杂.
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But Harvard has had a trickier time in India.
来自WSJ
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The biography of a spy is even trickier.
来自NEWYORKER