Here is the situation: One subject teacher is wrapping up his successful lesson - all kids in the class were listening to him with a lot interest and participated in all activities during the lesson. The homeroom teacher who was present in the classroom during the whole lesson comes up to him and says:
Here the homeroom teacher wants to say that the lesson was very interesting and was fun for children. I need only one word, adjective, right after "Very". What would be the best adjective here?