bombproof
adj.— «Riders are dressed casually in jeans, workout wear and riding helmets. They’re on horses referred to as “bombproof”—they’re unlikely to injure a rider.» —“Hockey on horseback: St. Louis club introduces polo for the masses” in Defiance, Missouri Canadian Press Aug. 10, 2008. (source: Double-Tongued Dictionary)
Further reading
A Montana farmer says his dad used to warn against catching the epizooty. In 1872, an epizootic respiratory disease among horses nearly brought the United States to a standstill. The word epizootic is modeled on the Greek word epidemic, from Greek...
The edge of the Grand Canyon. A remote mountaintop. A medieval cathedral. Some places are so mystical you feel like you’re close to another dimension of space and time. There’s a term for such locales: thin places. And: did you ever go...