Translation of hinterlistig

I hope that it is clear. You may need to press the regional button next to each input field. Then the control panel will open, there you must choose a checkbox. The value will be added to the text. The active input field is marked in green.
I am a computer scientist and I also have a small restaurant with my younger sister (she is also already 53). You can come and visit, I will buy you a drink and we could chat a little.
I will be doing my second year of studies abroad, probably in Panama. For that I will really want to learn Spanish. I know little about the Spanish language, but I will learn. I can help you with German.