When trying to avoid repetition in your writing, it's important to have a range of synonyms for words such as besmirching. While many different words could be considered synonyms, some of the most effective alternatives include defaming, slandering, tainting, sullying, and tarnishing. Each of these words can help to convey the same basic meaning as besmirching, while also offering additional nuance and context. For example, defaming may suggest a deliberate and malicious attempt to damage someone's reputation, while sullying may be used to describe a more accidental or incidental type of damage. No matter which synonym you choose, however, it's always important to ensure that the word you choose accurately reflects the intended meaning of your writing.