Antonyms for the phrase "has knowledge of" include terms like "ignorant," "unaware," "clueless," "unknowing," "unfamiliar," and "unacquainted." These words all suggest a lack of understanding or awareness about a particular subject or situation. They highlight a person's lack of knowledge, information, or experience, and they make it clear that the individual is not familiar with the topic at hand. Opposite phrases could also include "lacks expertise," "has no familiarity with," or "uninformed about." Using antonyms like these can help to emphasize the importance of knowledge and expertise in certain contexts, and can highlight the need to become better informed and educated.