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.
Catford divides untranslatability in two types:
linguistic untranslatability, that occurs when there is no lexical or syntactical substitute in the TL for an SL item;
cultural untranslatability due to the absence [...]
Traduttrice e redattrice tecnica