| The bridge was four miles above, but unscalable walls made it impossible for him to reach that. |
| The 3,000 foot Mount la Difensa was nearly unscalable, but scale it they did. |
| Cold, aching, and exhausted I swam in past the unscalable hulls of the ships toward the stone wall of the quay. |
| It's just that there is a very large mountain in the way, with nearly impassable bamboo thickets on its lower flanks and nearly unscalable granite faces on its higher reaches. |
| At each side rises an unscalable rock wall with a height of from three to six hundred feet. |
| Instead of rearing an unscalable barrier of gloomy mountains, Nature here showed a level front of sullen hostility. |
