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blowhard

noun [C]
 
/ˈbləʊ.hɑːd/ US  /ˈbloʊ.hɑːrd/ US informal disapproving

Definition

a person who likes to talk about how important they areBoastingShowing arrogance and conceit
(Definition of blowhard noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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