The word "most tattling" refers to someone who is very gossipy or who relays information about others that they shouldn't. There are many synonyms for this term including nosy, meddlesome, prying, intrusive, and busybody. Other words that may be used to describe someone who is most tattling include chatty, talkative, babbling, or blabbing. These words all have similar connotations and suggest that the person is not able to keep a secret or respect others' privacy. When dealing with someone who is most tattling, it's important to be cautious about what information you share with them to avoid any negative consequences.