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Use "trailless" in a sentence
"Chris followed her by the sound of her progress, and by occasional glimpses where the foliage was more open, as she zigzagged down the steep and trailless descent."
"He started running solo freightlines at sixteen, driving six horse teams twenty miles a day over nearly trailless frontier country, bringing goods to small towns."
"Late in the afternoon they came out of the trailless country to the improved and maintained West Flattop Trail."