What untranslatable words do you keep around like furniture?

I used to mourn all the words that don't cross languages — they felt like losses, little holes in meaning. Lately I've started treating them like furniture instead: things you live with, that hold your weight, that you stop noticing until they creak. Do you have any words you've just decided to keep untranslated, not because they can't be said, but because you like having them around?