I cannot let pass without protest the use, in Susan Thorpe's otherwise excellent article (Word Ways, Aug 1995) of POSSESSIONLESSNESSES. People who have possessions may have a wide variety of kinds and numbers of possessionfulnesses. But if several such persons were to lose their possessions would all be reduced to the null set and they would share in common a unique and singular possessionlessness, for which no plural is admissible.
Armstrong, David G.
Word Ways: Vol. 28
, Article 5.
Available at: http://digitalcommons.butler.edu/wordways/vol28/iss4/5