The phrase "has no doubt" implies a strong sense of certainty or belief. Its antonyms, on the other hand, convey feelings of uncertainty, disbelief, or doubt. Words such as unsure, doubtful, mistrustful, suspicious, and incredulous are examples of antonyms for "has no doubt." Additionally, words like skeptical, disbelieving, hesitant, and indecisive have a similar meaning to these antonyms. Antonyms are essential in language as they help in expressing different shades of meaning and emphasizing contrasting ideas. Using antonyms of "has no doubt" can reinforce the idea that there are different perspectives and opinions in any situation, and not everything is straightforward or certain.