The phrase "most wide-ranging" implies that something is extensive and covers a vast expanse. Antonyms for this phrase would be "limited," "narrow," or "restricted." Items that are limited or narrow in scope might focus on a specific niche or be constrained by boundaries. Conversely, something that is restricted might be subject to constraints or limitations, either by design or external factors. While antonyms of "most wide-ranging" suggest limitations, they can also connote positive qualities. For instance, something that is narrow might be more manageable or easier to control, while a restricted item might be more specialized or exclusive.