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Use "unfordable" in a sentence
"The sector, which had been quiet for most of four years, stretched some 20 miles from the unfordable Meuse River through the large Argonne Forest."
"The New River, a formerly dry barranca now pouring Colorado River water into the Salton Sea, soon became unfordable by conventional means."
"Owing to its swollen condition the river was unfordable but knowing that there was a covered bridge at Duguidsville, I hoped to secure it by a dash, and cross there, but the enemy, anticipating this, had filled the bridge with inflammable material, and just as our troops got within striking distance it burst into flames."