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Adjective: grandiloquent  gran'di-lu-kwunt
  1. Lofty in style
    "he engages in so much grandiloquent talk, one never really realizes what he is saying";
    - magniloquent, tall
  2. Puffed up with vanity
    "a grandiloquent and boastful manner";
    - overblown, pompous, pontifical, portentous

See also: pretentious, rhetorical

Encyclopedia: Grandiloquent