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Use "unridden" in a sentence
"George Halvorson provides a wonderful analogy having to do with "winter horses" - saddle horses who spend their winters unridden, in the barn, and who buck off the saddle and rider when they first goes back on in the spring."
"I saw a cake covered in regular unridden carrots yeterday, and immediately thought of you."
"Otherwise your efforts are about as much use as an unridden bicycle."