otiosity
The state or quality of being otiose.
countable, uncountable
There is no doubt that the ordinary reader would enjoy, and he certainly would profit much by, a revival of the classic work—if only he did not fall asleep over its magniloquent but perissological otiosity.
Where it comes from
From otiose + -ity, from Middle French ociosité, from Latin otiositas, from Latin otiosus + -itas (“-ity”).
Adapted from the Wiktionary entry otiosity (CC BY-SA 4.0).