What is another word for loose-lipped?
Pronunciation: [lˈuːslˈɪpt] (IPA) 
"Loose-lipped" is a colloquial expression commonly used to describe people who talk too much or reveal confidential information too easily. There are numerous terms that could be used as synonyms for this expression, and some of the most popular ones include "chatty," "gossipy," "blabby," "yakky," "jabbering," "verbose," and "voluble." These words can be used to describe people who tend to blurt out everything without considering the consequences of their words, whether intentionally or unintentionally. Other synonyms for "loose-lipped" may include "fluent," "loquacious," "talkative," "mouthy," "blabbermouth," and "blabberer," and they all suggest the same habit of talking excessively or without discretion.
