magniloquent
definition
using high-flown or pompous language
example
The politician's magniloquent speech promised to bring about great change, but many were skeptical of his lofty rhetoric.
synonyms
grandiloquentpompousostentatious
word origin — Derived from the Latin 'magniloquus', from 'magnus' meaning 'great' and 'loqui' meaning 'to speak'.