Thersitical is an adjective that means given to scurrilous language. 

Our word of the day comes from the Greek word for ‘little beast.’ In time, thersitical came to refer to plays that were rude or crude. It may also be used to describe the temperament of an unpleasant person, for example:

After grumbling all day about the weather, Paul had established a reputation as a thersitical guy. It wasn’t just that he didn’t like all those clouds. It’s more that he used such ugly language to articulate his contempt for them.