Sometimes, it's essential to express the opposite of the phrase "avail oneself of." The term means to take advantage of a particular opportunity, and an antonym would convey the opposite meaning. The opposite of "avail oneself of" could be "refrain from" or "ignore." These words might suggest that an opportunity or option is available, but the individual chose not to utilize it. Other antonyms of this phrase include "avoid," "disregard," and "miss out on." These terms communicate a lack of interest or a decision not to participate in something that could otherwise be beneficial. When used correctly, the antonyms can add variety and depth to the language.