At first sight, people may think that there are no synonyms for this common phrase. However, there are a few alternative ways to express the same idea. One phrase that is similar in meaning is "initially." This word connotes the idea of a first impression or something that takes place in the beginning. "At first glance" is another phrase that can be used instead of "at first sight." It emphasizes the importance of visual perception and implies that a quick observation can have a significant impact on one's opinion. Other options include "to begin with" or "startingly." Regardless of the phrase used, the idea of a first impression remains the central theme.