1709 24–26 Aug. A Cure, Speedy,..Never~failingly sure.
a1713 Ld. Shaftesbury Philos. Regimen in B. Rand (1900) 17 Every nature is constantly and never-failingly true to itself.
1814 F. Burney I. ii. xv. 300 This..waits no call, and is never failingly at hand.
1992 A. H. Halsey Pref. p. viii He is a never-failingly patient reader and critic.