The term "most espied" refers to something that is frequently observed or noticed. Some possible antonyms for this phrase could include rarely noticed, unobserved, or inconspicuous. These words suggest that there is something about the object or person in question that makes it less likely to attract attention, whether that be due to its size, color, or location. Other antonyms might include hidden, clandestine, or obscured, indicating that the object or person might be intentionally concealed or difficult to detect. By considering these different antonyms, we can begin to develop a more nuanced understanding of what it means for something to be "most espied.