Translation of unermüdlich

At noon the oldest soon came home. He was a doctor and gave me some salt and other Cuban medicine. I was reluctant to swallow that stuff but the pain and the doctor's smile persuaded me in the end.
How could I get better in Spanish if I had to eat by myself. Impossible. The next days we always ate together and sat around the table for hours discussing politics and the lives we were living.
The flight was a little late so we spent our time in the airport playing car race computer game. My wife won three times in a row, she is a better driver than me anyway. We flew to Puerto Madryn.