The word "art" is often associated with creativity and mastery, while "dilatory" refers to procrastination or sluggishness. Therefore, antonyms for the phrase "art dilatory" could include terms like efficient, prompt, or swift. These words suggest a sense of urgency and productivity, which contrasts with the negative connotations of "dilatory." Other antonyms could include terms like diligent, industrious, or steadfast, all of which describe characteristics that are highly desirable in any creative endeavor. Ultimately, the choice of antonyms will depend on the specific context in which the phrase is being used, as well as the desired tone and emphasis.