The phrase "art forthcoming" refers to the idea of anticipated creativity and upcoming displays of artistic expression. Antonyms for this phrase would include "artless" or "uncreative." These words suggest a lack of artistic ability or imagination. "Dull" or "uninspired" may also be used as antonyms for "art forthcoming," implying a lack of spark or originality. Finally, "stagnant" or "lifeless" may be used to describe a lack of movement or energy in creative work, which is the opposite of "art forthcoming.