Mean-spirited

Worse still was the mean-spirited stuff that it was OK for my friends to know about, but the thought of anyone else knowing about it made me itch with shame.

You're a mean-spirited man.

Just stop with the mean-spirited stuff.

You may think he is a friendly guy, but once you get to know him a little more, you start to know just how mean-spirited he can be.

I must admit that his hateful act towards you was pretty mean-spirited.

I'll show you just how much of a mean-spirited person I am.

My old acquaintances would sneer at me as a mean-spirited cur, whose best exploit was to get in jail.