Loudmouth

//ˈlaʊdˌmaʊθ// noun, slang

Definitions

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

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

  2. 2
    a person who causes trouble by speaking indiscreetly wordnet

Etymology

From loud + mouth.

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