The phrase "didst service" is an old English term that means "served." Some antonyms for this phrase could include "abandoned," "neglected," "ignored," or "rejected." These words convey a sense of neglect or mistreatment towards the person or object in question, as opposed to the act of serving. Other possible antonyms could include "disobeyed," "disrespected," "defied," or "disregarded." These words imply a deliberate action on the part of the subject to go against the expectations or requests of another. In general, any word that conveys a lack of care, respect, or obedience could be considered an antonym for "didst service.