How to Use "impregnable" with Example Sentences

1. A new iron curtain is being drawn around russia . It 's not so impregnable or wide as the soviet one .

2. Although the structure is now defunct , the mosque 's former glory lingers in the towering arched gate and the seemingly impregnable walls .

3. But not until 1947 did the supreme court construe this to mean that a wall between church and state " must be kept high and impregnable " .

4. History is littered with fallen titans , from united steel to ibm , whose leadership once seemed impregnable .

5. Some republicans privately concede mr obama 's position may be impregnable .