If you describe someone's behaviour as ostentation, you are criticizing them for doing or buying things in order to impress people.
例句
Consumers are abandoning the excess and ostentation of the 1980s...消费者摒弃了20世纪80年代铺张摆阔的陋习。On the whole she had lived modestly, with a notable lack of ostentation.大体上说,她生活俭朴,不事张扬。
英汉词典释义
n.
摆阔,讲排场
I don’t like the ostentation of their expensive life-style.他们生活奢侈,爱摆阔,我不敢恭维。
英英词典释义
Noun
1. a showy outward display
2. lack of elegance as a consequence of being pompous and puffed up with vanity