a. Fond of, or evincing, ostentation; unduly conspicuous; pretentious; boastful. [ 1913 Webster ]
Far from being ostentatious of the good you do. Dryden. [ 1913 Webster ]
The ostentatious professions of many years. Macaulay. [ 1913 Webster ]
-- Os`ten*ta"tious*ly, adv. -- Os`ten*ta"tious*ness, n. [ 1913 Webster ]