The phrase "has a hunch" refers to having a feeling or intuition about something. An antonym for this phrase could be "is clueless," which means having no understanding or insight about a particular situation. Another antonym could be "is certain," indicating a strong belief or conviction about a topic, rather than a vague feeling. Alternatively, "is skeptical" could be an antonym for "has a hunch," meaning to doubt or question the validity of an idea or theory. To be "confused" is also an antonym for the phrase, indicating a lack of clarity or understanding about a situation.