The word "art intemperate" can be broken down into two parts: "art" meaning skill or creativity and "intemperate" meaning lacking restraint or self-control. Antonyms for "art" could include words like ignorance, incompetence, or clumsiness, while antonyms for "intemperate" might be self-restraint, moderation, or composure. Together, these antonyms could be used to describe someone who approaches their art with a calm and thoughtful attitude, carefully weighing each decision and avoiding impulsivity or recklessness in their work. Alternatively, they could describe someone who lacks the necessary skills to create art of a high quality, but who nevertheless approaches their work with humility and a willingness to learn.