Describes someone who is very determined and unwilling to change their mind.
A pesar de que todos le aconsejaban, el hombre testarudo siguió su propio camino sin escuchar a nadie.
Despite everyone advising him, the stubborn man followed his own path without listening to anyone.
A pesar de ser testarudo, a veces aprende de sus errores con el tiempo.
Despite being stubborn, sometimes he learns from his mistakes over time.