1. Hole in the Wall's impregnable.

2. Casterly Rock is an impregnable fortress.

3. Completely impregnable I hear you say.

4. 5 They will establish impregnable fortresses.

5. Subject, verb, object: the unadorned, impregnable sentence.

6. Severus fled to Ravenna, an impregnable position.

7. Their impregnable arguments are hard to rebut.

8. 16 The heights of Kennesaw were impregnable.

9. After all, their city was the impregnable Babylon!

10. 18 " The lines around Kennesaw Mountain are impregnable.

11. Ten questions, each more impregnable than the last.

12. 17 On this problem,(www.Sentencedict.com) she was impregnable.

13. Babylon was surrounded by huge walls and seemed impregnable.

14. 1 The lofty walls of the castle seemed impregnable.

15. The Bundesbank's seemingly impregnable position has begun to weaken.

16. 11 The team built up an impregnable 5-1 lead.

17. 3 The Bundesbank's seemingly impregnable position has begun to weaken.

18. 2 The team built up an impregnable 5-1 lead.

19. The dike that is protected by Mangrove forest is impregnable!

20. 13 The Bundesbank's seemingly impregnable position has begun to weaken.

21. 14 Grant was still mired in the mud before impregnable Vicksburg.

22. Can the Survival Capsule company convince Japan that its impregnable Bathyspheres …

23. The old Dutch fort with its thick high walls looks virtually impregnable.

24. 15 And Andrus would be untouched, impregnable behind his rigid simplicities.

25. Put a chain across the door, bolt it shut, think they're impregnable.

26. 12 The case Starr builds must be as impregnable as Fort Knox.

27. Fortify thyself with contentment: that is an impregnable stronghold. Epictetus 

28. 23 Although encircled by its enemies, I knew just how impregnable it was.

29. 19 The old Dutch fort with its thick high walls looks virtually impregnable.

30. 30 The problem invariably is that the enemy is simply inflexible or impregnable.

31. 9 As a working theory this is impregnable, whether considered sceptically or superstitiously.

32. 8 Occupying fairly impregnable clifftop villages, they prospered in the practice of agriculture.

33. But what made the Calcutta industry impregnable was the ' absurdly low price ' of jute .

34. It's a social citadel; it's an impregnable fortress which resists any assault, any alternative.

35. 7 Fortify thyself with contentment: that is an impregnable stronghold. Epictetus 

36. 11 The Confederates considered the works impregnable, but they did not depend solely upon them.

37. Built in 1537 of brick, it has immense circular mural towers and massive, impregnable walls.

38. 20 Despite burglar alarms and window locks, homes are never impregnable against determined thieves.

39. 4 Surrey have been building up an impregnable lead in this season's County Championship.

40. 14 Despite burglar alarms and window locks,(www.Sentencedict.com) homes are never impregnable against determined thieves.

41. 21 Almost the only place where the Conservatives did badly was the normally impregnable Birmingham.

42. Antonyms for Assailable include guarded, protected, safe, secure, invulnerable, shielded, resistant, well protected, impregnable and defended

43. A Bacn-mesh would create a complex, impregnable, and mutually reinforcing communication network with multiple relay nodes.

44. 25 Built in 1537 of brick, it has immense circular mural towers and massive, impregnable walls.

45. 13 The great and impregnable fortress is accessible by means of four highways built on lofty viaducts.

46. Jutting from the foaming Mediterranean like an impregnable fortress, Corsica resembles a miniature continent, with astounding geographical diversity.

47. Vauban had advocated a system of impregnable fortresses along the frontier that would keep France's enemies out.

48. 28 The conventional wisdom having been made more or less identical with sound scholarship, its position is virtually impregnable.

49. The sprawling tobacco empires, once impregnable bastions of political and economic might, are being attacked at every turn.

50. 29 Their mountainous homeland with its fortress valleys was a near impregnable base from which to sally forth.

51. 27 Its plush vegetation crowded the restraining fence that had been made strong, damned near impregnable, to hold it back.

52. 26 They did not want to waste their time, effort, money and future chances in taking on an impregnable President.

53. 10 It must be impregnable, especially if attacked by the adherents of those long established religious beliefs that confer privileges.

54. Fort Morro, to the left, Beetled over the waves like some sombre and impregnable defence of the Middle Ages

55. 22 It was stacked with the usual assortment of crates and containers, impregnable behind an ingenious array of clamps and locks.

56. It was stacked with the usual assortment of crates and containers, impregnable behind an ingenious array of clamps and locks.

57. 24 The one factor that still tilts general election predictions in the Tories' favour is that their hillcrest position seems ultimately impregnable.

58. A contingent of rebels held out in the virtually impregnable Kenilworth Castle and did not surrender until the drafting of the conciliatory Dictum of Kenilworth.

59. But he has also revealed how some ill-judged words from a TV pundit played a part in his impregnable display against Arsenal on Sunday.

60. After initial rapid advancement, the war in Europe ground to a halt as two great enemy armies became deadlocked along a 960-kilometre front of impregnable trenches.

61. Ahmednagar Fort, once considered almost impregnable, was used by the British to house Jawaharlal Nehru (the first prime minister of India) and other Indian Nationalists before Indian independence.

62. Airtight: 1 adj not allowing air or gas to pass in or out Synonyms: air-tight , gas-tight tight of such close construction as to be impermeable adj having no weak points “an Airtight defense” “an Airtight argument” Synonyms: air-tight invulnerable immune to attack; impregnable

63. The success of the German Fallschirmjager ("Parachute Hunter") units early in the war--particularly glider operations against the Dutch and a stunning victory over Belgian forces at the seemingly impregnable Fort Eben-Emael in May 1940--sent notice to the United States about the usefulness of Airborne troops.