invalidity
noun [ U ] uk/ˌɪn.vəˈlɪd.ə.ti/ us/ˌɪn.vəˈlɪd.ə.t̬i/
(NOT OFFICIAL)
无效，不合法
the condition of not being legally or officially acceptable
(ILLNESS)
病弱（而不能工作或照顾自己）
the condition of being too ill to work or care for yourself