Torah
Yes I heard this in more than one shiur from Rabbi Tatz and others. He also says that theres no word for nature. Teva is a word made up by the Rabbanan in the Talmudic times. Anyways, the way he explains it if I recall correctly is that Judaism is purpose driven there no such thing as purposeless things. Fun in and of itself is empty a waste of time and a way to distract ourselves from reality. That’s not to say one shouldn’t have a good time but when one has a good time it should be for Hashem so that he or she will be refreshed and relaxed and able to serve Hashem better. America is obsessed with fun and we think we need to waste hours a day on fun. Its American brainwashing. Ask your grandparents if they are alive how they spent their time as kids (pre ww2) you will see that it was never normal for kids and teens and certainly not adults to waste as much time as we do. I include myself in this rebuke. We have too many distractions today and it costs us in many ways.