Characterized by grandiloquence; using grand, impressive, or exaggerated language.
Direct from Latin grandiloquus (grandis 'large' plus loqui 'to speak'), this is essentially an alternative form of grandiloquent, with the Latin -ous ending preserved instead of being anglicized to -ent.
English borrowed this word directly from Latin rather than creating it from scratch, which is why we have two similar forms—grandiloquent and grandiloquous. Most speakers use grandiloquent, making grandiloquous a rarer variant that linguists call a 'doublet' or 'variant.'
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