[in.ex.pug.na.ble] adj [ME in-expungnabull, fr. MF, fr. L inexpugnabilis, fr. in- + expugnare to take by storm, fr. ex- + pugnare to fight--more at pungent] (15c) 1: incapable of being subdued or overthrown: impregnable "an ~ position"
2: stable, fixed "~ hatred" -- in.ex.pug.na.ble.ness n -- in.ex.pug.na.bly adv