Flapped tongue is a phrase that describes a person who talks too much, often in a gossipy or unpleasant manner. While there are many synonyms for this phrase, such as chatterbox, blabbermouth, and motormouth, there are several antonyms that represent the opposite of flapping one's tongue. These include reticent, introverted, quiet, and reserved. These words describe individuals who are more likely to listen than to talk, and who take a more thoughtful and measured approach to communication. While it can be tempting to flapp one's tongue, using antonyms to describe a more restrained and thoughtful approach can lead to better outcomes in personal and professional relationships.