叵测

This maneuver of his is a diabolical conspiracy.

这一手是一个居心叵测的大阴谋。

It is disingenuous of him to flatter me.

阿谀奉承，是居心叵测。

Don't harbo(u)r unkind thoughts.

别心怀叵测。

His ungentlemanly attempts to discredit the sale of drugs by his professional brethren would by-and-by recoil on himself.

心怀叵测，指责同行出药品的作风，也总有一天会得到报应，自食恶果。