breakneck

Modifies a noun

• speed: She could skin a rabbit or pluck a chicken at breakneck speed using a knife with expert skill.
• pace: The Club Runners shot off at a breakneck pace with the rest of us trying in vain to keep up.
• growth: Now the world's second-biggest oil consumer, China's breakneck economic growth is fueling record oil imports.
• chase: Just four short chapters later there's been a dangerous journey, a pitched battle and a breakneck chase.
• action: You see, with this much breakneck action on screen, you simply won't have the time or inclination to utilize them effectively.
• development: China continues to race forward with breakneck economic development.