incessancy

From incessant.

incessancy (usually uncountable, plural incessancies)

1. The quality of being incessant; unceasingness.
   • 1794, Timothy Dwight, Greenfield Hill:

     Or chatter, with incessancy of tongue / Careless, if kind, or cruel, right, or wrong

   • 1891, “Incessancy of the Yellow Warbler's Song”, in The Oölogist‎, volume 9, page 65:

     Most birds confine their song principally to the morning and evening hours, and if they do not do this entirely, they surely quiet down at midday, when scarcely a sound is to be heard, but not so the Yellow Warbler,–morning, noon, and night, he keeps it up, and the incessancy of his singing has become to be a matter of remark.

   • 2003, Richmond Barbour, Before Orientalism: London's Theatre of the East, 1576-1626‎, page 68:

     What troubled them was its incessancy.