α. 1386. Rolls of Parlt., III. 225/1. The Mairaltee,… were it never so unprenable.
1481. Caxton, Godfrey, cxxxii. 196. A dongeon … upon an hylle…, whiche the turkes holde so strongly that it is unprenable.
1560. Daus, trans. Sleidane’s Comm., 211. The Castell … which for the situation was vnprennable.
β. 1545. Elyot, Inexpugnabilis, vnpreignable.
1561. Daus, trans. Bullinger on Apoc., 536. Therefore was there neuer any thing … so mightie or vnpregnable, whiche the inuincible power of God can not bring to naught.
1572. Twyne, Dionysius’ Surv. World, E iv b. Semiramis … enuironed it wt an vnpregnable wal.
1632. Sherwood, s.v.
