There are a variety of synonyms that can be used to describe when something became less intense. One possible option is "ebbed," which suggests a gradual decrease in intensity over time. Another possibility is "abated," which implies a sudden or dramatic reduction in intensity. "Waned" is another word that can be used to describe a lessening of intensity, particularly when referring to the fading of a particular feeling or emotion. Other possible synonyms include "subsided," "diminished," "relaxed," and "moderated," all of which convey the idea that something that was once intense has now become less so.