叵测

This maneuver of his is a diabolical conspiracy.

他手是个居心叵测的大阴谋。

It is disingenuous of him to flatter me.

他对我阿谀奉承，是居心叵测。

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

他心怀叵测，指责同行出售药品的作，也总有天会得到报应，自食恶果。

Don't harbo(u)r unkind thoughts.

别心怀叵测。