FLASHILY
flamboyantly, showily, flashily
(adverb) in a fancy colorful manner; “he dresses rather flamboyantly”
meretriciously, flashily
(adverb) in a meretricious manner; “the boat is meretriciously decorated”
Source: WordNet® 3.1
Etymology
Adverb
flashily (comparative more flashily, superlative most flashily)
In a flashy manner
Source: Wiktionary
Flash"i*ly, adv.
Definition: In a flashy manner; with empty show.
FLASHY
Flash"y, a.
1. Dazzling for a moment; making a momentary show of brilliancy;
transitorily bright.
A little flashy and transient pleasure. Barrow.
2. Fiery; vehement; impetuous.
A temper always flashy. Burke.
3. Showy; gay; gaudy; as, a flashy dress.
4. Without taste or spirit.
Lean and flashy songs. Milton.
Source: Webster’s Unabridged Dictionary 1913 Edition