Word/Phrase: relentless
Translation: implacable
Pronunciation: imˈplakable
He is relentless in his pursuit of success - Él es implacable en su búsqueda del éxito
She showed a relentless determination - Ella mostró una determinación implacable
The relentless rain caused flooding - La lluvia implacable causó inundaciones
They faced relentless challenges - Enfrentaron desafíos implacables
His relentless spirit inspired others - Su espíritu implacable inspiró a otros