If you're looking for synonyms for the term "strong thinning," there are many options available. One synonym might be "slenderizing," which refers to the idea of making something more slender or slenderizing a particular area of the body. Another option might be "toning," which implies strength and the development of lean muscle mass. Other possible synonyms could include "sculpting," "firming," "shaping," "trimming," or "streamlining." Ultimately, the best synonym for "strong thinning" will depend on the specific context in which you're using the term and what you're hoping to convey with your message.