grandiloquent
adjective/ɡrænˈdɪləkwənt/
/ɡrænˈdɪləkwənt/
(formal, disapproving)- using long or complicated words in order to impress people synonym pompousWord Originlate 16th cent.: from Latin grandiloquus, literally ‘grand-speaking’, from grandis ‘grand’ + loqui ‘speak’. The ending was altered in English by association with eloquent.
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grandiloquent