From Latin 'grandis' (great) + 'loquī' (to speak) — speech that is pompously lofty in style but often hollow in substance.
Pompous or extravagant in language, style, or manner, especially in a way that is intended to impress. Using lofty, high-flown speech.
From Latin grandiloquus (speaking grandly, using lofty or elevated language), a compound of grandis (great, large, full-grown, grand) + loquī (to speak, to talk), with the English suffix -ent added on the analogy of eloquent, magniloquent. The PIE root underlying loquī is debated; some reconstruct *tolkʷ- (to speak). Cicero and Quintilian used grandiloquus in a relatively neutral or even positive sense for the elevated, full
The close relative 'magniloquent' (from Latin 'magnus,' great, + 'loquī') means almost the same thing but is even rarer. English thus has two Latin-derived words meaning 'speaking grandly' — 'grandiloquent' and 'magniloquent' — plus the native Germanic 'high-flown.' The redundancy is itself a kind of grandiloquence: the language uses three words where one
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