What does "invalidness" mean?

invalidity; the state of being invalid

What is a synonym for "invalidness"?

Common synonyms include: invalidity.

noun

noun ·Rare ·Advanced level

Noun

1
invalidity; the state of being invalid uncountable
"the invalidness of reasoning"
2
illogicality as a consequence of having a conclusion that does not follow from the premisses wordnet

From invalid + -ness.