Art, as a source of strength, is a phrase that denotes the powerful impact that artistic creations can have on people's emotional and psychological well-being. However, there are antonyms to this phrase that suggest a lack of inspiration or motivation. For instance, the antonyms for "art" could include words such as blandness, dullness, and lifelessness, which imply a lack of creativity and imagination. Similarly, "a source of strength" could be countered by terms like weakness, depletion, and frailty, which refer to a lack of vigor and energy. In short, the antonyms for "art a source of strength" are terms that suggest the opposite of creativity and empowerment.