Art remiss, meaning a lack of care or the failure to carry out responsibilities, can have several antonyms. One of its antonyms is conscientiousness, which means being diligent, responsible, and attentive to tasks. Another antonym is carefulness, which connotes the act of being cautious, thorough, and paying close attention to details. On the other hand, slackness refers to a lack of effort, energy, or focus in executing responsibilities. Similarly, negligence can be another antonym for art remiss, which implies a failure to exercise proper care or fulfill duties. Last but not least, mindfulness, indicating being deliberate, attentive, and present, can also be an antonym for art remiss.