Untranslatability
（重定向自Traduttore traditore）
Untranslatability is a property of a text, or of any utterance, in one language, for which no equivalent text or utterance can be found in another language when translated.
Terms are, however, neither exclusively translatable nor exclusively untranslatable; rather, the degree of difficulty of translation depends on their nature, as well as on the translator's knowledge of the languages in question.