reclusiveness

reclusive +‎ -ness

reclusiveness (uncountable)

1. The state or characteristic of being reclusive.
   • 2006 February 4, Erica Wagner, “First word: People don't love Harper Lee—they love her work”, in Times Online, London, retrieved 29 June 2007:

     But of Lee you hear hardly anything at all; she is nearly as famous for her reclusiveness (now there’s an oxymoron) as J. D. Salinger.

• isolation
• publicity-shyness

• “reclusiveness”, in OneLook Dictionary Search.
• Oxford English Dictionary, 2nd ed., 1989.