- 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.