I am going to dispute the statement that there is no word in Loshon Hakodesh for “fun.”
English being a different languages with different origins, is often not going to have words that perfectly translate to and from Hebrew. But words are merely constructs for concepts. The Hebrew word “l’sachek” is used to refer to acting for “play” or “fun.” I think that it is definitely close enough that is incorrect to claim that there is no word for “fun” in Loshon HaKodesh.