Source : Webster's Revised Unabridged Dictionary (1913)

Showily \Show"i*ly\, adv.
   In a showy manner; pompously; with parade.

Source : WordNet®

showily
     adv 1: in an ostentatious manner; "Mr Khrushchev ostentatiously
            wooed and embraced Castro at the U.N. general
            assembly" [syn: {ostentatiously}, {with ostentation}]
     2: in a fancy colorful manner; "he dresses rather flamboyantly"
        [syn: {flamboyantly}, {flashily}]