HSK 7-9
空洞
kōngdòng名形
cavity; empty; vacuous
这篇文章内容空洞缺少事实。
Zhè piān wén zhāng nèi róng kōng dòng quē shǎo shì shí.
This article is empty in substance and lacks facts.
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Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.