The antonyms for "more undermining" are words that connote a sense of improvement or strength. Words like "positive," "constructive," "advancing," and "encouraging" all imply a sense of progress and success. Antonyms like "uplifting," "inspiring," and "reinforcing" suggest a sense of confidence and resilience, and can help to counteract negative and limiting beliefs or attitudes. These words serve as a reminder that setbacks and challenges can be overcome, and that progress is always possible. By incorporating these antonyms into daily language and thought patterns, individuals can cultivate a more positive, proactive mindset that promotes growth and success.