There are several synonyms for the word "trekked," which means to make a long and difficult journey on foot typically in order to explore or enjoy the natural environment. Some synonyms for "trekked" include hiked, marched, tramped, journeyed, roamed, wandered, and trekked. Each of these words conveys the sense of a lengthy, arduous journey, but they may be used to express different nuances or purposes. For example, "hiked" might connote a more leisurely or recreational activity, while "marched" could imply a more disciplined or military undertaking. Whatever word you choose, its connotation can help shape the reader's impression of the journey or the explorer's state of mind.