命知らず

(1)marked by defiant disregard for danger or consequences; "foolhardy enough to try to seize the gun from the hijacker"; "became the fiercest and most reckless of partisans"-Macaulay; "a reckless driver"; "a rash attempt to climb Mount Everest"

(2)危険または結果の挑戦的な軽視によって特徴づけられる

(1)