中文词源
pregnable 易受攻击的，弱的，可攻破的
来自古法语prenable,可占领的，可攻破的，来自（缩写自）拉丁语prehendere,抓住，占领，词源同comprehend,prehensile.插入字母g可能是习惯性作用。
英语词源
- pregnable (adj.)
- 1530s, alteration of Middle English preignable, earlier prenable (early 15c.), from Old French prenable "assailable, vulnerable," from stem of prendre "to take, grasp, seize," from Latin prehendere "to take hold of, to seize" (see prehensile).