Antonyms for the phrase "more concerning" could include "less alarming," "less worrying," "less disconcerting," or "less unsettling." These antonyms imply that the situation or issue being discussed is not as dire or serious as it may initially appear. Other possible antonyms for "more concerning" could be "less significant," "less pressing," or "less urgent." These words suggest that the matter at hand is not as important or immediate as previously thought. In any case, the use of antonyms can be helpful in providing balance and nuance to language, encouraging more precise communication and a deeper understanding of complex topics.