pregnable

from The Collaborative International Dictionary of English v.0.48

Pregnable \Preg"na*ble\, a., [F. prenable. See {Impregnable}.]
   Capable of being entered, taken, or captured; expugnable; as,
   a pregnable fort. [R.] --Cotgrave.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

21 Moby Thesaurus words for "pregnable":
      aidless, assailable, attackable, beatable, conquerable,
      defenseless, expugnable, fatherless, friendless, guideless,
      helpless, leaderless, motherless, penetrable, surmountable,
      unfriended, unprotected, untenable, vincible, vulnerable, weak

[email protected]