invalidity
/ˌɪnvəˈlɪdətɪ/noun
mass noun
1
- Brit. the condition of being an invalid〈英〉病残, 病弱, 伤残。
2
- the fact of not being valid无效, 无价值：
the resolution on the invalidity of their independence declaration.
关于他们的独立宣言无效的决议。