invalidity
Word family (noun) validity ≠ invalidity (adjective) valid ≠ invalid (verb) validate ≠ invalidate
From Longman Dictionary of Contemporary EnglishRelated topics: Illness & disabilityinvalidityin‧va‧lid‧it‧y /ˌɪnvəˈlɪdəti/ AWL noun [uncountable] formal 1 MIthe state of being too ill, old, or injured to work invalidity benefit2 ILLEGALthe state of being not legally or officially acceptable