Learner's definition of PERSISTENT
[more persistent; most persistent]
1 : continuing to do something or to try to do something even though it is difficult or other people want you to stop
We were nagged by a persistent salesman.
He is one of the government's most persistent critics.
She has been persistent in pursuing the job.
2 : continuing beyond the usual, expected, or normal time : not stopping or going away
He has been fighting a persistent cold/infection.
Flooding has been a persistent problem in the area this year.
Persistent rumors that the business is for sale have alarmed the staff.