na-adjective, noun which may take the genitive case particle 'no', noun
Describes something involving a high level of risk or danger. Used as a noun, adjectival noun (na-adjective), or prenominal (no-adjective).
Antonyms: ローリスク
この投資はハイリスクだが、リターンも大きい。
This investment is high-risk, but the returns are also large.
ハイリスクな手術を受ける決断をした。
I decided to undergo a high-risk surgery.