But it would be a great mistake to infer that this ostentatiousness of authority concealed real servility.
ostentatiousness had, I am afraid, more to do with it than love of art for art's sake.
1701, from ostentation + -ous. Earlier in a similar sense were ostentative (c.1600); ostentive (1590s). Related: Ostentatiously; ostentatiousness (1650s).