Translation of cynic in German

Once the rain stopped we continued to visit some other sites within the city, among them a popular Pagoda, which was not in the center. We took a cab there and enjoyed this beautiful place of worship.
I learn things really fast and easily. I also know Italian well. I can make whole conversations in Italian. You are a fast learner, because Italian is a hard language to learn, especially for German speakers.
I think I have to switch back to English. It will take me two years until I write an entire letter in German and I suppose I do not have the time for it. Does that mean that I am not serious about learning?