Speaking in a grandiose, elevated, or pompous manner; characterized by lofty-sounding but often empty or insincere language.
From Latin altus (high) and loquens (speaking), with the adjective suffix -ent, describing someone who speaks in an elevated or high manner, often excessively so.
An altiloquent speaker is doing what we might call 'verbal peacocking'—dressed-up words designed to impress rather than communicate, a behavior psychology suggests comes from insecurity masked by verbosity.
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