The term "art conscientious" is related to the act of being careful and meticulous while creating a piece of art. Some antonyms to this phrase can be careless, reckless, negligent, and haphazard. Being careless implies a lack of concern or attention to detail, while recklessness denotes a disregard for consequences. Negligence involves neglecting duties or responsibilities and haphazard refers to a lack of planning or organization. Therefore, the opposite of "art conscientious" describes a disorderly and sloppy approach to creating art. In short, antonyms of "art conscientious" signifies a lack of care, precision, and attention to detail.