"Untrieder" is a German word that means "untried" or "untested." It can be challenging to find synonyms for this word, as it pertains to a specific context wherein something is not yet proven or experienced. However, some phrases that may be similar to "untried" include "untested" or "unfamiliar." Additionally, one might describe something as "unproven" or "unverified." In a more poetic sense, using phrases like "innocent" or "untouched" might be appropriate. It is worth noting that the word "untried" is often used in a legal context, referring to a person who has not yet been put on trial. In this case, synonyms might include "unindicted" or "unaccused".