bombast

那位教授的讲座充满了华丽的辞藻，却没有任何实质内容。

The professor's lecture was full of ___bombast, but contained no real substance.

那位政客的演讲充满了夸张的言辞，却缺乏实质内容。

The politician's speech was full of ___bombast, with exaggerated claims but no real substance.