The state of being invalid; lack of validity. (noun)
Examples of word invalidity
Thirdly, claiming invalidity is not as easy as the Conservatives would have us believe, and implies that the medical profession are just giving sick notes away, willy-nilly.
He recommended that Marshoff obtain legal advice about ways to rectify the "invalidity" of her decision in the absence of the committee's advice.
A rare "invalidity" this -- a little confusing easy classifications.
Thoreau's mark even in the short later period of "invalidity" was complete and robust independence and triumph over it -- a thing which I have no doubt wholly captivated
However, she said that if the patent office "did not have all the material facts before it," its decision to award a patent "may lose significant force," and it could be easier to persuade a jury of a patent's invalidity by clear and convincing evidence.