Translation of "die-hard" into Spanish

Continuing budget deficits have visibly failed to deliver what die-hard Keynesians had promised.

Los continuos déficits fiscales han incumplido visiblemente la promesa de los keynesianos empedernidos.

But residual networks, including die-hard extremists with transnational links, continue to fuel the insurgency.

Sin embargo, existen redes residuales, incluidos extremistas intransigentes con nexos transnacionales, que continúan alimentando la insurgencia.