loudmouth

From loud +‎ mouth.

• IPA^(key): /ˈlaʊdˌmaʊθ/

• Audio (US):

  (file)

loudmouth (plural loudmouths)

1. (slang, derogatory) One who talks too much or too loudly, especially in a boastful or self-important manner.

   Synonyms: bigmouth, big mouth, blowhard, blusterer, boaster, braggart; see also Thesaurus:braggart

   Coordinate term: motormouth

   I hear every word spoken by the loudmouth in the next office.

• mouth off
• shoot one's mouth off