1529. More, Dyaloge, I. Wks. 168/2. If ye will take a sure and vnfallyble way ye must beleue and obey the churche.
1545. Brinklow, Compl., 5 b. It is certen and vnfallible, that if we knock, we shal be hard.
1592. R. D., Hypnerotomachia, 82 b. Disposing my selfe to her sweete loue, with an unfallyble, obstinate, and firme resolution.
1614. Latham, Falconry, 68. These my friendlie admonitions, being grounded vpon the absolute truth of vnfallible experience.
1653. Blithe, Eng. Improver Impr., 145. A very Excellent Unfallible Remedy against Barrenness.