居心叵测的英文：
[Literal Meaning]
harbor intentions/impossible/guess
to harbor evil intentions that others cannot guess

[解释]
怀有阴险的目的，无法推测。

[Explanation]
with hidden intent

[例子]
你不要被他的表面所迷惑了，我觉得他居心叵测。

[Example]
Don't be fooled by his facade. I'm afraid that he harbors evil intentions.

Ugly threats,rumours,insinuations,etc
居心叵测的威胁、谣言、旁敲侧击等

This maneuver of his is a diabolical conspiracy.
他这一手是个居心叵测的大阴谋。

This maneuver of his is a diabolical conspiracy
他这一手是个居心叵测的大阴谋。

She always has an ax to grind. You should take whatever she says with a pinch of salt
她总是居心叵测,对她说的话你得多留神

The combatants were unequally matched. Elias was anger, Cornelis spiteful
争斗的双方是力量悬殊的。伊莱亚斯怒气冲冲，科内利斯则居心叵测。

I expressly declare here and now that this rumor was simply the invention of evil-minded relations.
我在这里明确地声明:这个谣言纯系居心叵测的亲戚恶意捏造。