Adverb
In a showy manner; pompously; with parade.
Source: Webster's dictionaryIf the child is left to himself, he will think more and better, if less showily. Let him go and come freely, let him touch real things and combine his impressions for himself. Anne Sullivan Macy
he dresses rather flamboyantly Source: Internet
Mr Khrushchev ostentatiously wooed and embraced Castro at the U.N. general assembly Source: Internet