Definition - one given to bombast
Bombast is defined as “pretentious inflated speech or writing,” and we all know at least one person (and some of us know many) who is given to engaging in this. The word may be traced to the Latin bombax, meaning “cotton”; the initial meaning of bombast in English was “cotton or any soft fibrous material used as padding or stuffing.” The “cotton stuffing” sense has largely fallen by the wayside, but we have retained the “inflated speech” meaning.
You started with Hood, the Bombaster,
That man of self-reputation,
Determin’d at once to pull down,
Charles Fox the support of the nation.
— James Hartley, History of the Westminster election, 1784