* Untrodden: This is the most direct antonym, meaning not walked on or traversed.
* Untouched: This suggests something that has not been interfered with or altered.
* Unmarred: This implies something that is pristine and free from damage or marks.
* Unspoiled: This emphasizes the preservation of something in its natural state.
* Fresh: This indicates something new, unused, and unblemished.
* New: This denotes something that has never been used or experienced.
The best antonym will depend on the specific meaning of "trodden" in the sentence. For example, if you are talking about a path that has been trodden, "untrodden" might be the best choice. However, if you are talking about a piece of fabric that has been trodden on, "untouched" or "unmarred" might be more appropriate.