In a grandiose manner; with grand, impressive, or exaggerated style and manner.
From grandiose (from Italian grandioso, originally a musical term, from Latin grandis 'large') plus -ly (adverb-forming suffix). Grandiose entered English in the 18th century, initially describing musical style, then expanded to describe any grand or impressive manner.
The word 'grandiose' started as a musical direction meaning to play in a grand, majestic style—many musical terms in English come from Italian. It's a good reminder that words often migrate from specialized fields (like music) into general use with slightly different meanings.
Complete word intelligence in one call. Free tier — 50 lookups/day.