ostensive C2+

/ɑˈstɛnsɪv/ directly demonstrating or pointing out, especially by example

ostentation C2+

/ˌɑstɛnˈteɪʃən/ showy display intended to impress or attract attention

ostentatious C2+

/ˌɑstɛnˈteɪʃəs/ characterized by vulgar or pretentious display; designed to impress