The phrase "speaks ill of" is used to describe instances where someone is disparaging or criticizing another person. Although it's a commonly used phrase, there are several synonyms that can be used in its place. Some of the most common synonyms for "speaks ill of" include "criticizes," "defames," "denigrates," "disparages," "slanders," "smears," and "vilifies." Each of these words conveys a similar meaning to "speaks ill of" but can add a different level of intensity to the criticism. In any case, it's always important to choose your words and actions carefully to avoid unnecessary hurt or conflict.