空洞 kōngdòng cavity
cavity; empty; vacuous
How to remember 空洞: 空 empty + 洞 cave = cavity.
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How it is used
- Chiefly figurative: hollow and empty of substance - 内容空洞 (nèiróng kōngdòng) vacuous content; 空洞的口号 an empty slogan.
- As a noun it also means a physical cavity/hole (e.g. in a lung X-ray).
- Contrast 空虚 (kōngxū), which is about an inner emotional void; 空洞 is about lacking real content.