Antonyms for the word "art trained" include words that indicate a lack of training or skill in the realm of art. These words could include unskilled, unschooled, inexperienced, or untutored. One could also use words more generally related to art, such as uncreative or uninspired. However, it is worth noting that the term "art trained" itself could be somewhat vague, as it could refer to formal education or self-taught skills. As such, one might consider using more specific antonyms depending on the context, such as "untrained in painting" or "not proficient in sculpture.