面と向かって誉めるような人は、とかく陰で悪口を言うものだ。の英語

Such men as praise you to your face are apt to speak ill of you behind your back.

One who praises you to your face, is sure to speak ill of you behind your back.

Those who praise you to your face, are sure to abuse you behind your back.

A man who praises you to your face, is sure to abuse you behind your back.

A man who praises you to your face, is sure to speak ill of you behind your back.

to abuse one to one's face

Don't speak ill of others behind their back.

What a man to abuse your benefactor!

No man has been more talked against than he.

A man who praises you to your face is sure to speak ill of you behind your back.

It is unbecoming in a gentleman to speak ill of others.

You'll be punished by Heaven for saying bad things about your benefactor.

You will incur the wrath of God if you speak ill of your benefactor.

Never speak ill of others.

He is foul-tongued―foul-mouthed―a scurrilous reviler.

He is foul-tongued―foul-mouthed―foul-spoken―a scurrilous reviler.

He is a foul-mouthed man―a foul-tongued man―a foul-spoken man―a scurrilous reviler.

You had better not speak ill of others.

Don't speak ill of others.

Don't say bad things about others.

It is a foolish idea to think of injuring a man by calumny.

It is a foolish idea to think of injuring others by calumny.

an act of pretending to obey a person while saying bad things about him or her behind his or her back

You gain nothing by speaking ill of others.

of a personality, a liking for saying bad things about others

call a person names

I heard someone uttering maledictions in the crowd.

I have no time for people who speak ill of others.

If you have a bone to pick with a person, tell it to his face instead of saying things behind his back.

He gives no heed to people's remarks.