- that can be captured, as a fortress
- that can be attacked or injured; assailable or vulnerable
Origin of pregnablealtered (infl. by pregnant) ; from Middle English prenable ; from Middle French ; from prendre, to take ; from Classical Latin prehendere: see prehensile
Being such that attack, seizure, or capture is possible; vulnerable or assailable: a pregnable fortress.
Origin of pregnableMiddle English preignable, pregnabul, from Old French prenable, pregnauble, from prendre, to grasp, from Latin prehendere, prēndere; see ghend- in Indo-European roots.