Here are a few sites that document words that exist in other languages but not in English.
What does it mean that these words don’t exist in English? Do these words tell us something about the cultures they come from? About us? Is it generally random chance that cultures invent words for some concepts but not for others? If a word can’t directly be translated, does it mean that the concept cannot truly be known to nonnative speakers of those languages?
http://www.babbel.com/magazine/untranslatable-01
http://mentalfloss.com/article/50698/38-wonderful-foreign-words-we-could-use-english