The phrase "doest to a T" means to do something perfectly or precisely. Antonyms for this phrase could include "imprecise," "inaccurate," "inept," "clumsy," and "sloppy." These words indicate a lack of precision and attention to detail. Other antonyms could include "careless," "haphazard," "careless," "botched," and "bungled." These words suggest a lack of care and effort in completing a task. It is essential to keep in mind the antonyms of "doest to a T" to avoid these negative connotations and ensure a job is done correctly - resulting in a successful outcome.