unfaltering
US /ʌnˈfɑːl.t̬ɚ.ɪŋ/
UK /ʌnˈfɑːl.t̬ɚ.ɪŋ/

1.
inquebrantable, firme, constante
not faltering; firm or steadfast
:
•
Her unfaltering determination led her to success.
Su determinación inquebrantable la llevó al éxito.
•
He showed unfaltering loyalty to his team.
Mostró una lealtad inquebrantable a su equipo.