vainglorious

他那自负的演讲只夸耀自己的贡献，完全忽视了团队的共同努力。

His ___vainglorious speech boasted only about his own contributions, completely ignoring the team's collective effort.

他整晚都在向客人展示自己收集的奖杯，这种虚荣的炫耀让客人在九点前就都走光了。

He spent the entire evening showing guests his collection of awards, a ___vainglorious display that cleared the room by nine.

那位新同事原来十分自负，在闲聊中动不动就提起自己的常春藤学历。

The new hire turned out to be ___vainglorious, constantly mentioning his Ivy League degree in casual conversations.