2 sentences for 空洞 (kōng​dòng — vacuous)

1. 他的文章辞藻华丽，但内容空洞。

   tā de wén​zhāng cí​zǎo huá lì, dàn nèi​róng kōng​dòng.

   His writing is ornate, but the content is hollow.

   Source: Dong Chinese Dictionary

2. 这篇报告辞藻华丽，但内容十分空洞。

   zhè piān bào​gào cí​zǎo huá​lì, dàn nèi​róng shí​fēn kōng​dòng.

   The report is flowery but devoid of substance.

   Source: Dong Chinese Dictionary