FASTUOUS Meaning of FASTUOUS in English [fas.tu.ous] adj [L fastuosus, fr. fastus arrogance] (1638) 1: haughty, arrogant "a ~ air of finality --Carl Van Vechten" 2: ostentatious, showy "disdained ~ ceremonies" Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012