free solo
noun
the act or sport of climbing a rockface without using rope, harness, or any other aids or equipment.
The grammatical form denoting more than one person, place, thing, or idea.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“It’s kind of the nature of rock to change over time,” says Alex Honnold, a professional climber from Sacramento, California, who is known for his daring ropeless free solos.
From National Geographic ● Jul. 31, 2015