loudmouth

Meaning: an obnoxious person who talks too much and too loudly

For example:

When Charlie drinks alcohol, he turns into a boring, bragging loudmouth. No wonder he never gets invited to dinner parties.
Takahiro wondered if all Americans were overweight loudmouths, or just the ones who visited Japan.

Note: a common adjective derived form this word is "loudmouthed", as in "A loudmouthed fan yelled out when Tiger was hitting his shot."

Quick Quiz:

People often called Tom a loudmouth because he

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