The phrase "of old school" often connotes a traditional or conservative mindset. Antonyms for this phrase would include terms like modern, contemporary, progressive, or innovative. These words suggest a willingness to accept change, embrace new ideas and experiment with unconventional methods. Another antonym could be unconventional, which suggests a disregard for traditional methods and a willingness to take risks. Other antonyms might include radical, insurgent, or avant-garde, which describe a willingness to break from norms and challenge established ways of thinking. By considering these antonyms, individuals can identify their own approach to thinking and problem-solving and determine the values and principles that define them.