The opposite of being more opportunistic is to be less opportunistic. This means that a person is less focused on taking advantage of every opportunity that arises, and instead, may be more cautious or reflective before making decisions. Other antonyms for "more opportunistic" could include words like honest, sincere, upright, and principled. These words suggest a level of moral responsibility or ethical behavior that may be absent from a more opportunistic approach. In contrast, less opportunistic individuals may prioritize values like trustworthiness, fairness, and ethics when evaluating potential opportunities. Ultimately, whether a person is more or less opportunistic is often tied to their personal values and how they view the world around them.