grandiloquence

/ɡrænˈdɪləkwəns/
noun
  1. Speech or writing that uses fancy, complicated, or exaggerated language to sound impressive, often making the meaning less clear.
    • Her essay was full of grandiloquence, using words like 'paradigm' and 'synergy' where simpler terms would do.
    • The CEO's speech was criticized for its grandiloquence; employees wanted clear instructions, not flowery phrases.
    • The politician's grandiloquence impressed the audience, but few could explain what he actually promised.