persevere
Definitions
To continue in a course of action even in the face of difficulty or with little or no prospect of success.
To persist steadily in an undertaking, state, or enterprise despite opposition or discouragement.
Examples
Despite the numerous setbacks, she decided to persevere until she achieved her goal.
It is important to persevere through difficult times if you want to succeed in the long run.
The marathon runner had to persevere through intense physical pain to reach the finish line.