magniloquence

/mæɡˈnɪləkwəns/
noun
  1. Speech or writing that is very grand, fancy, or impressive-sounding, often in a way that seems exaggerated or not sincere.
    • Her essay was full of magniloquence, using big words to hide a lack of real ideas.
    • The CEO's magniloquence at the meeting made the simple announcement sound like a historic event.
    • The politician's magniloquence impressed the crowd, but few believed his promises.
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