The opposite of "more arousing" can be "less stimulating" or "unexciting." If something is not as arousing, it may be lacking in passion or intensity. It could also be considered dull or mundane. Other antonyms for "more arousing" may include "calming," "soothing," or "boring." These words reflect a decrease in mental or physical stimulation and highlight the contrast to something that would be considered "more arousing." Ultimately, the use of these antonyms may depend on the context and the individual's personal preferences or desires.