perseverant       
adjective  formal uk/ˌpɜː.sɪˈvɪə.rənt/ us/ˌpɜː.sɪˈvɪə.rənt/
 坚持不懈的,锲而不舍的
trying to do something or continuing to do something in a determined way, despite having problems
  Farming is for people who are ambitious and perseverant. 农耕是有志向、有毅力的人才做得到的。 
 There was a perseverant knocking at the door. 有人在不停地敲门。 
 - More examples
- This indeed was a very difficult task, and I tried to sway Andrea from it, but she was perseverant.
- I pride myself on being both careful and perseverant enough to get the job done.
- You have to be perseverant with some children.