Take any agglutinative language (Hungarian, Finnish, etc.) or one with propensity for constructing words by gluing other words together (German) and you will fi

Take any agglutinative language (Hungarian, Finnish, etc.) or one with propensity for constructing words by gluing other words together (German) and you will find thousands of "words" that have no single word English equivalent. Some of the words from the list are interesting, but overall this is quite superficial, "word" is not a building block in the exact same way in all languages. Besides, some items are not words but expressions, one is a slang term related to mobile phones, that probably has equivalents in most languages, a large part of the words refer to some sort of melancholy or nostalgia. Not exactly that? Well, I'm sure the word "melancholy" already means something different for any two persons, let alone speakers of different languages. That being said, I always have trouble explaining "kitsch" in English (see the M. Kundera link :) and always have trouble understanding "serendipity" in languages other than English :)