Translation of widerstandsfähig

In the meantime I am listening to some Spanish CDs. They are intended for the car, but no one can tell you when to listen to it, how many times and how often. Please understand that I work a lot.
She found it very unromantic that a man would not declare friendship to a woman. Anyway, after an hour or so they got off at a town called Chetumal which was on the border with Belize, where they lived.
On the way back I visited a private beach resort. I just wanted to see whether I could get in and it was not a problem at all. The resort belonged to some club on the main land near Cancun.