The phrase "doest well" typically implies that someone is performing or achieving something successfully. Antonyms for this phrase could include terms such as "underperforming," "struggling," or "failing." These words suggest that someone is not doing well or may need improvement in their efforts. Common antonyms for "doest well" may also include terms like "unsatisfactory," "inadequate," or "subpar," which indicate a lack of quality or meeting expectations. Alternatively, one could use antonyms like "mediocre," "poorly," or "inferior," which indicate a lesser standard of performance. Overall, antonyms for the phrase "doest well" can be used to describe a lack of success or achievement in a variety of contexts.