The phrase "unsuccessful run" means that a particular attempt or try at something did not achieve the desired result or meet the intended goal. Full definition
Be mindful of the physics at play here and you'll keep your racer from landing on his neck during unsuccessful runs. (heavy.com)
Sometimes you have to employ tactics to stop yourself from falling into the mistakes of previous and unsuccessful runs of a level. (flickeringmyth.com)
Jacobs, a lifelong city resident and former healthcare administrator, made unsuccessful runs for Common Council in 2007 and 2009 and mayor in 2011. (hudsonvalleyone.com)