叵测

This maneuver of his is a diabolical conspiracy.

他这一手是一个居心叵测大阴谋。

It is disingenuous of him to flatter me.

他对我阿谀奉承，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.

他心怀叵测，指出药风，也总有一天会得到报应，自食恶果。