unfructuosityn.
Etymology: Previous versions of the OED give the stress as: unfructuˈosity.
the world > existence and causation > creation > productiveness > unproductiveness > [noun]
1884 29 Mar. 4/8 The intellectual unfructuosity of the Royal stock.
This entry has not yet been fully updated (first published 1924; most recently modified version published online June 2019).