The Oxford Thesaurus An A-Z Dictionary of Synonyms - grandiose adj.

1) pretentious, ostentatious, showy, flamboyant, bombastic, histrionic, extravagant, pompous, fustian, high-flown, high-flying, overambitious, overdone, over-dramatic, melodramatic, Ossianic, inflated, affected, florid, flashy, Colloq highfalutin or hifalutin, flash: The council is unimpressed by your grandiose plans to redevelop the area, Mr Wren. 2) imposing, impressive, ambitious, grand, monumental, magnificent, lofty: She has some grandiose ideas for a national symphony orchestra.