Persist (verb)

1. To continue to do something despite difficulties or opposition.
2. To continue to exist or occur over a prolonged period.
3. To refuse to give up or let go of something.

Origin:

Late 16th century: from latin persistere, from per- "through" + sistere "take a stand".

Examples:

1. He persisted in his efforts to find a job.
2. She persisted in her studies despite the challenges.
3. The bad weather persisted for days.
4. He persisted in asking the question.
5. She persisted in her belief despite the evidence.