Antonyms for the phrase "availing oneself of" would include avoiding, neglecting, rejecting, and shunning. These terms suggest an intentional decision not to seek or utilize a particular resource or opportunity. For example, instead of availing oneself of a free tutoring service, someone might choose to avoid it and struggle with their studies on their own. Neglecting to utilize available resources could also result in missed opportunities for personal or professional growth. In contrast, actively rejecting or shunning certain resources may be a deliberate action taken for personal or moral reasons. Therefore, the choice to avail oneself of resources or not can reveal a person's values and priorities.