Unusually interesting linkbait:
5. Litost
Czech – Milan Kundera, author of The Unbearable Lightness of Being, remarked that “As for the meaning of this word, I have looked in vain in other languages for an equivalent, though I find it difficult to imagine how anyone can understand the human soul without it.” The closest definition is a state of agony and torment created by the sudden sight of one’s own misery.
Matador Network: 20 Awesomely Untranslatable Words from Around the World