Synonyms of 'loudmouth'
bigmouthDictionary, noisily, swaggerer
He is a loudmouth, and very spoilt too.
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a person who boasts loudly or exaggeratedly; bragger
a swaggering jovial prankster and braggart
If you call someone a windbag, you are saying in a fairly rude way that you think they talk a great deal in a boring way.
He's just a boring old windbag.
Thesaurus for loudmouth from the Collins English Thesaurus
If you describe someone as a loudmouth , you are critical of them because they talk a lot , especially in an unpleasant , offensive , or stupid way.