The antonyms for the word "art adequate" can vary depending on the context used. Some of the antonyms that can be used include "poor," "insufficient," "inadequate," "unacceptable," "mediocre," and "unsatisfactory." When discussing an artwork or performance, these antonyms suggest that the piece was lacking in some way or failed to meet a certain standard of quality. In a broader sense, antonyms like "inept," "incompetent," and "amateurish" can be used to describe a lack of skill or expertise in a particular field. Whatever the context may be, the antonyms of "art adequate" convey the idea of something that falls short of expectations or standards.