All 4 Uses

ostentatious
in
The Good Soldier
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Well, she was a Powys married to an Ashburnham—I suppose that gave her the right to despise casual Americans as long as she did it unostentatiously.†
Part 1

unostentatiously = not in a manner intended to attract notice and impress others

standard prefix: The prefix "un-" in unostentatiously means not and reverses the meaning of ostentatiously. This is the same pattern you see in words like unhappy, unknown, and unlucky.
She opened the door of Ashburnham's room quite ostentatiously, so that Florence should hear her address Edward in terms of intimacy and liking.†
Part 1 *

ostentatiously = in a manner intended to attract notice and impress others
She had as many priests to stay with her as could be needed—and even the priests did not want a gorgeous chapel in that place where it would have merely seemed an invidious instance of ostentation.†
Part 3

ostentation = actions intended to attract notice and impress others
At the time I thought that that was because of a New England dislike for necrological ostentation.†
Part 4

Definitions:

(1) (ostentatious)
intended to attract notice and impress others -- especially with wealth in a vulgar way
(2) (meaning too rare to warrant focus)