Definition of «failed effort»

The phrase "failed effort" means trying really hard to do something but not succeeding in achieving the desired result.

Have you been involved in failed efforts to analyze data and facilitate instructional improvements? (ascd.org)
All of this has to be considered within the state's failed efforts at pension reform earlier this year. (publicsectorinc.org)
When have these «many failed efforts prior» occurred? (justarsenal.com)
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