blabbermouth

American  

[blab-er-mouth] / ˈblæb ərˌmaʊθ /

noun

plural

blabbermouths

1. a person who talks too much, especially indiscreetly.

   Synonyms:

   tattler, bigmouth, talebearer, busybody, gossipmonger, gossip

---

blabbermouth British  

/ ˈblæbəˌmaʊθ /

noun

1. informal a person who talks too much or indiscreetly

---

Etymology

Origin of blabbermouth

An Americanism dating back to 1935–40; blabber ( def. ) + mouth

Example Sentences

Because Holland, of course, is also somewhat of a blabbermouth.

From Washington Post • Apr. 19, 2019

“I’m not known for being a blabbermouth, you know?” the soft-spoken Abdul-Jabbar concedes with a smile, something else he was never particularly known for during his playing days.

From Seattle Times • Feb. 14, 2018

“Stings a little doesn’t it? You finally thought you’d met your match: a blabbermouth who’s as thin-skinned and narcissistic as you are. “

From Washington Times • Feb. 28, 2017

Paul was sort of a blabbermouth — like most 20-something, non-pros with freakish talent.

From Salon • Feb. 19, 2017

Most faithfully yours, his mother, Patria Mercedes But Nelson found out about the letter from his little blabbermouth aunt in the capital.

From "In the Time of the Butterflies" by Julia Alvarez