Ostentatious can be pictured as something turned so that you cannot fail to see it. The point is never how much a thing cost or how much feeling went into an act; the point is that it has been placed where an audience will catch it. A watch worn on the outside of a sleeve, a bunch of flowers too big for the table, a sigh loud enough for the back of the room — the same move each time. That is why the word so rarely sounds like praise: saying it names the wish to be seen.
From the word’s history
The source dates the word to 1590 and analyses it as Latin ostentātus plus -ious. The idea of putting something on show is therefore in the word from the start, which is why senses about money and senses about pure display sit together under it.
字典記這個字在 1590 年代進入英文，來自拉丁文 ostentātus 加上字尾 -ious。「擺出來給人看」這個意思從一開始就在字裡，所以講錢的用法和純粹講排場的用法，才會共用同一個字。
Wiktionary (kaikki extract kaikki:3f6f69a190036ae4:826040991:23691), ostentatious: 'Originated 1590; from Latin ostentātus + -ious.'
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