The phrase "looked right through" implies that someone either ignored or failed to acknowledge something or someone, either intentionally or unintentionally. Some synonyms for this phrase include "ignored," "disregarded," "neglected," "overlooked," "snubbed," "dismissed," and "rejected." These words convey a sense of disregard and lack of recognition. However, some synonyms carry a more forceful connotation, such as "disdained" or "spurned," which can imply a deliberate act of rejection or disrespect. Regardless of the specific word used, the meaning remains the same: to look past or ignore someone or something.