certainlier

adv

1. (comparative, form-of, obsolete, rare)comparative form of certainly: more certainly

   “We are ſayd to receiue, to obteyne, to gette that whiche ſo farre as concerneth the felyng of our faith, is geuen vs of the Loꝛde, whether he doo then fyꝛſt teſtifie it, oꝛ beyng teſtified dothe moꝛe and certainlier confirme it.”

   “[…] withall let them vnderſtande, and be well aſſured, that the M. M. Adventurers both know, and regarde the eſſentiall partes, groundes, and pillers of Trafficque, and of olde tyme haue put them in practiſe, and yet at this day doe quietelier, better, & certainlier obſerue, and mainteyne them, then the Cuſtomers of the out Portes (I feare me) doe their office: […]”