Definition of high-risk adjective from the Oxford Advanced Learner's Dictionary

 

high-risk

 adjective
adjective
BrE
 
; NAmE
 
[usually before noun]
 
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involving a lot of danger and the risk of injury, death, damage, etc. a high-risk sport high-risk patients (= who are very likely to get a particular illness) compare low-riskExtra examples Ideally the technique should be limited to high-risk patients. It’s a high-risk venture that will require a lot of capital. Rock climbing is a high-risk sport that requires special equipment and training.
See the Oxford Advanced American Dictionary entry: high-risk