Synonyms of 'bravado'
The threats may be an act of bravado.
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Bluster is also a noun.
the bluster of their campaign
Bombast is trying to impress people by saying things that sound impressive but have little meaning.
There were men aboard who could not tolerate his bombast.
Thesaurus for bravado from the Collins English Thesaurus
Bravado is an appearance of courage or confidence that someone shows in order to impress other people.