The word "peculiar" means strange, unusual, or distinctive. But if you're looking for different ways to express this idea, there are several synonyms you can use. Some options include "curious," which suggests an interesting or unexpected quality, and "odd," which implies something out of the ordinary. "Quirky" is another possibility, conveying a sense of individuality or eccentricity. For a more formal tone, "idiosyncratic" is a good choice, indicating a unique or distinctive trait. "Uncommon," "singular," and "extraordinary" are additional synonyms that capture the idea of something special or exceptional.