invalidity
/ˌɪnvəˈlɪdəti/
noun
- The state or quality of being not valid, especially in a legal or official sense; lack of soundness or effectiveness.
- He argued the invalidity of the contract because it was signed under pressure.
- Scientists debated the invalidity of the study's conclusions due to flawed data.
- The invalidity of the signature meant the will could not be accepted.