GRANDIOSELY
bombastically, grandiosely
(adverb) in a grandiose manner; “the building was bombastically spacious”
Source: WordNet® 3.1
Etymology
Adverb
grandiosely (comparative more grandiosely, superlative most grandiosely)
In a grandiose manner
Source: Wiktionary
GRANDIOSE
Gran"di*ose", a. Etym: [F. grandiose, It. grandioso. See Grand.]
1. Impressive or elevating in effect; vimposing; splendid; striking;
– in a good sense.
The tone of the parts was to be perpetually kept down in order not to
impair the grandiose effect of the whole. M. Arnold.
The grandiose red tulips which grow wild. C. Kingsley.
2. Characterized by affectation of grandeur or splendor; flaunting;
turgid; bombastic; -- in a bad sense; as, a grandiose style.
Source: Webster’s Unabridged Dictionary 1913 Edition