noun. Weakness; infirmity.

noun. Lack of validity; want of cogency, force, or efficacy; specifically, lack of legal force: as, the invalidity of an argument or of a will.

noun. Lack of validity or cogency; lack of legal force or efficacy; invalidness.

noun. Lack of health; infirmity.

noun. The state of being invalid; lack of validity.

noun. illogicality as a consequence of having a conclusion that does not follow from the premisses

"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."

illogic  illogicality  illogicalness  inconsequence  

fallaciousness  

applicability  batiste  carer  conclusiveness  eighty-percent  

infirmity  invalidness  nugatoriness  nullity  voidness