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showing extreme courage; especially of actions courageously undertaken in desperation as a last resort; "made a last desperate attempt to reach the climber"; "the desperate gallantry of our naval task forces marked the turning point in the Pacific war"- G.C.Marshall; "they took heroic measures to save his life"
fraught with danger; "dangerous waters"; "a parlous journey on stormy seas"; "a perilous voyage across the Atlantic in a small boat"; "the precarious life of an undersea diver"; "dangerous surgery followed by a touch-and-go recovery"