The phrase "didst disservice to" implies a harmful action was taken towards someone or something. Some synonyms for this phrase may include "wronged," "mistreated," "hurt," "harmed," "damaged," "injured," "offended," "insulted," or "slighted." Each of these words conveys a sense of negative impact or effect on the subject being referenced. When using these synonyms, it is important to consider the specific context and connotation to accurately convey the intended meaning. Choosing the appropriate synonym can help to enhance the message and effectively communicate the severity of the action taken.