The antonyms for the phrase "art suitable" are words like unsuitable, inappropriate, improper, unfitting, inadequate, and incompatible. The term art suitable refers to something that is appropriate or fitting for a particular artwork or creative expression. So, on the contrary, unsuitable means something that does not fit or blend in with an artwork or creative work. Inappropriate and improper suggest wrongness or impropriety regarding the suitability of the art. Unfitting implies something that is not harmonious or does not match the artwork's theme, while inadequate suggests insufficiency or lack of appropriateness for the artwork. Lastly, incompatible means something that is not conducive or suitable enough for the artwork.