What is the word for the words that there are no words for?

The term for Words or concepts that lack a specific Word in a language is "untranslatable." These Words often capture unique emotions, experiences, or cultural nuances that don't have direct equivalents in other languages. Examples include "schadenfreude" in German, which describes the pleasure derived from someone else's misfortune, and "hygge" in Danish, which conveys a sense of coziness and comfort.