Translation of inexhaustible in German

We want to fly there again on Christmas, depending on Jenny's work. Maya entered kindergarden last week, and there were a lot of tears (mainly by her mother and not by herself. I guess that is natural.
We added context sentences for some of our predefined vocabulary lessons. Our language trainer now supports multiple answers as well, however in our predefined lessons we did not implement this option.
We found an password solution to enable teachers and their students to work with your lessons. These teachers would need to enter the password of the lessons and could then continue to use them.