Antonyms of "more mind-expanding" include words such as "limiting," "restricting," "constricting," and "narrowing." These antonyms suggest a lack of openness, curiosity, and exploration, and instead imply a closed-mindedness and a reluctance to think outside of familiar boundaries. Other antonyms may include words like "distracting," "boring," "tedious," or "mediocre." Such words suggest a lack of intellectual stimulation or inspiration, and instead imply a dullness, an unoriginality, or a sense of being disengaged from deeper, more challenging ideas. When looking for ways to expand one's mind, it is important to be aware of these antonyms and actively work to avoid them in favor of more fruitful, thought-provoking pursuits.