I saw this feature in the March issue of Reader's Digest: Eight expressions that ought to exist in our native tongue but don't. The excerpt comes from a travel site called Matador Network.
My favorite is "jayus" from Indonesian: "a joke so poorly told and so unfunny that one cannot help but laugh." Check out the list of "20 Awesomely Untranslatable Words from Around the World" by Jason Wire.
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