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[flaming-tyger.livejournal.com]

bombastic-adjective  [bom-bas-tik]
(of speech, writing, etc.) high-sounding; high-flown; inflated; pretentious.

http://dictionary.reference.com/browse/bombastic

The employees weren't too enthusiastic about their new boss to begin with, and his bombastic emails didn't do anything to boost his popularity.