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Use "unrideable" in a sentence
"American Jonathan Page on one of the course's many unrideable hills."
"But the summer-like conditions extended only so far, as a week of rain in Belgium turned an already challenging course — featuring a series of steep, technical descents and often unrideable climbs — into a course that many racers described as one of the hardest they had seen."
"Of course, it could be that Urban Velo simply received a better specimen than I did, but then again theirs was technically unrideable since it arrived with the wrong seatpost:"