slanderous and harmful
malign - badmouth
The word ‘malign’ can be used in two different ways, both related to a general sense of wickedness. Firstly, it can express deliberately saying unpleasant things about somebody that you know to be untrue. Secondly, it can also describe something evil and damaging in nature or influence. While it is related to the similar word ‘malignant’, neither is directly derived from the other.
I’m suing the newspaper because I feel that I have been unfairly maligned by them in recent weeks.
Although the movie has been much maligned by critics, I personally found it highly enjoyable.
Jack is a malign influence on his co-workers. He seems to bring out the worst in people.