unremittingness

from The Collaborative International Dictionary of English v.0.48

Unremitting \Un`re*mit"ting\, a.
   Not remitting; incessant; continued; persevering; as,
   unremitting exertions. --Cowper. -- {Un`re*mit"ting*ly}, adv.
   -- {Un`re*mit"ting*ness}, n.
   [1913 Webster]