There are several synonyms for the term "gentleman of leisure" that are commonly used in the English language. One synonym is "bon vivant," which refers to a person who enjoys the finer things in life and lives a life of luxury and indulgence. Another term is "man of leisure," which is similar to "gentleman of leisure" but can be used to refer to any gender. Other synonyms include "idler," "playboy," "rich idler," and "socialite." While these terms all convey the idea of someone who is wealthy and enjoys a life of leisure, they can also carry somewhat negative connotations, implying a lack of purpose or work ethic.