The Global Language Monitor estimates that there are currently 1,009,753 words in the English language. Despite this large lexicon, many nuances of human experience still leave us tongue-tied. And that’s why sometimes it’s necessary to turn to other languages to find le mot juste.
Fifteen foreign words with no direct English equivalent can be found at the link. I must admit that I’m only familair with Luftmensch, a Yiddish word that describes “an impractical dreamer with no business sense. Literally, air person.” I’ve known a few.