bluster
blus-ter
noun
Loud, aggressive talk or behaviour, often empty and intended to intimidate.
"His threats were just empty bluster."
verb
To speak or act loudly and aggressively, often without real effect.
"He would often bluster when confronted."
Thesaurus
Synonyms: blow, boast, gas, brag, swash, shoot a line, gasconade, tout, vaunt, swagger, bravado, rodomontade