The phrase "has notion" refers to someone having an idea, belief, or opinion about something. Some antonyms for this phrase may include "unclear," "confused," "ignorant," "unaware," or "uninformed." These words describe a lack of understanding or knowledge about a particular topic. Other antonyms could be "open-minded," "flexible," or "objective," which indicate a willingness to consider multiple perspectives and change one's beliefs based on new information. Overall, the antonyms for "has notion" convey a sense of ambiguity, confusion, and an absence of a firm belief or understanding.