bom·bast 
(bŏmbăst′)
(bŏmbăst′)n.
1. Grandiloquent, pompous speech or writing.
2. Grandiose or overpowering expression, as in music or painting.
[Alteration of obsolete bombace, cotton padding, from Old French, from Medieval Latin bombax, bombac-, cotton; see BOMBAZINE.]
bombast′er n.
bom·bastic adj.
bom·basti·cal·ly adv.