The unyielding will to keep pushing forward towards a goal despite obstacles, hardships, and a lack of motivation, passion, and energy.
Gavin got sick at football practice - he wasn't feeling good, was tired, his body was aching, it was extremely hot outside, he puked 3 times, and the coach even told him to just go home and rest BUT he stayed and KEPT practicing! That little 8 year old has Grit!
a significant predictor of success
The girls' got enough grit to accomplish the job.
An inherent, positive non-cognitive (meaning mostly unaware) personality trait that enables perseverance through otherwise difficult or impossible obstacles over a long period of time without the loss of passion and is the resolve that requires courage to mold strength of character as a driving force to successful and often self fulfillment. It is often combined with the definition of resilience.
Eminem has grit. So does an organization in the Philippines called blackwing.