空虚

1. Origins, structure, and basic meaning

• Structure: 空虚 is read くうきょ and describes physical emptiness or an inward feeling of hollowness.
• Basic usage: In 成功した後も心には空虚さが残った。, a feeling of emptiness remains even after success.

2. Common pitfalls and similar expressions

• Naming the quality
  • 空虚さ uses さ to turn the quality into the noun emptiness. 空虚に見えた uses に before the verb to mean looked empty.