When something becomes less intense, it means it has reduced in strength, severity or force. There are various synonyms which can be used to convey this message in a more concise or specific manner. One of the most common synonyms is "subside", which means to become less intense, violent or agitated over time. Other synonyms include "abate" which implies a gradual decrease in intensity or severity, "diminish" which means to make something less prominent or intense, and "moderate" meaning to reduce the intensity to a less extreme level. With these synonyms, one can express the reduction in intensity in a more nuanced and contextualized way, depending on the situation.