空虚 kōngxū hollow
hollow; emptiness; meaningless
How to remember 空虚: 空 empty + 虚 false = hollow.
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How it is used
- An inner emptiness - emotional or spiritual void - 内心空虚 (nèixīn kōngxū) to feel empty inside; 精神空虚 spiritually hollow.
- About feelings and meaning, unlike 空洞 (kōngdòng, empty of content) or 空 (physically empty).
- Register is a touch literary; common in describing loneliness or purposelessness.