uncrossable

But beyond questions are the connections forged across what seem to be uncrossable chasms.

Kelly Figueroa-Ray: Getting Stuck In Clay: An Interfaith Reflection Kelly Figueroa-Ray 2011

Better grow an impenetrable forest and throw up a few uncrossable mountains!

Kristin Cashore - An interview with author 2010

Too many fences and uncrossable creeks where I hunt.

do you use ATVs when hunting? 2009

Too many fences and uncrossable creeks where I hunt.

do you use ATVs when hunting? 2009

But beyond questions are the connections forged across what seem to be uncrossable chasms.

Kelly Figueroa-Ray: Getting Stuck In Clay: An Interfaith Reflection Kelly Figueroa-Ray 2011

Until Jane Goodall discovered chimps using twigs to probe for tasty termites, tool use had been considered, like language, an uncrossable boundary separating humankind from the rest of animate creation.

Birdology Sy Montgomery 2010

This is the Sierra Madre, grand and imposing, and until the completion of this road, a daunting and virtually uncrossable barrier separating the coast from the rest of Mexico.

Outside Mazatlán: Mexico's real Sierra Madre 2008

This is the Sierra Madre, grand and imposing, and until the completion of this road, a daunting and virtually uncrossable barrier separating the coast from the rest of Mexico.

Outside Mazatlán: Mexico's real Sierra Madre 2008

The idea of different strains of life growing with uncrossable barriers between them—I think he guessed at the purpose of the Wall.

Pathfinder Orson Scott Card 2010

There were days when we did not speak, nights when we drew uncrossable lines down the middle of the bottom sheet.

In the Fullness of Time Emily W. Upham 2010