strong-willed
US /ˌstrɔŋˈwɪld/
UK /ˌstrɔŋˈwɪld/

1.
voluntarioso, firme
determined to do what one wants even if other people advise against it
:
•
She is a very strong-willed person who always achieves her goals.
Ella es una persona muy voluntariosa que siempre logra sus metas.
•
Despite the challenges, he remained strong-willed and never gave up.
A pesar de los desafíos, se mantuvo firme y nunca se rindió.