And now, since you suggested it, the Merriam-Webster entries:
Definition of MALICIOUS
: having or showing a desire to cause harm to someone :
(which can be said in the case of repeated attempts to undermine someone's reputation)
Definition of SLANDER
transitive verb
: to utter slander against : defame
(I admit, the better wording would have been probably "malicious libel" since Merriam-Webster obviously considers the verb version, not a substantive form of "slander". However, since this definition also refers to defame, the expression is clear)
Definition of DEFAME
transitive verb
1
archaic : disgrace
2
: to harm the reputation of by libel or slander
3
archaic : accuse
(Which can be said in a case, of repeated attempts to undermine someone's reputation)
Comments in brackets () from me. So, I looked up in the dictionary, the words say, according to Merriam-Webster, what I tried to express, even, I could have used instead of "slander" the term "libel". However, I consider it not a bad result for a non-native speaker. Let me know whether you think, Merriam-Webster is no authority for English vocabulary and therefore, I had it all wrong.
Peter