The phrase "more off the wall" suggests a level of extreme or unconventional behavior. Its antonyms would be "conventional," "ordinary," "mainstream," "commonplace," and "normal." These words describe the opposite of being outrageous or unpredictable in one's actions or personality. While being "off the wall" can be entertaining or exciting, being too unconventional can also be seen as chaotic or disruptive. Thus, the opposite words can suggest a level of stability and predictability that can be comforting to some. Ultimately, it is up to the individual to decide what level of creativity or conformity they wish to embody.