High-risk (adjective)

1. Having a great possibility of danger, harm, failure, or loss.
2. Involving a large amount of uncertainty, danger, or potential loss.

Origin:

Late 20th century: from high + risk.

Examples:

1. The high-risk investment strategy is not recommended for conservative investors.
2. The high-risk venture required a lot of courage and determination to succeed.
3. The high-risk mission was successful due to the skill and bravery of the team.
4. The high-risk experiment produced unexpected results that challenged current theories.
5. The high-risk sport requires a lot of practice, training, and physical fitness.