Idiosyncracies are the unique personality traits that make an individual distinct from others. However, there are many other words that can be used instead of idiosyncracies. These include quirks, eccentricities, peculiarities, habits, tendencies, and peculiar traits. Some other synonyms for idiosyncracies include oddities, peculiarities, foibles, whimsies, and singularities. Each of these words carries a slightly different connotation, but they all refer to the unique characteristics that make people who they are. Understanding these synonyms can help people better describe both themselves and others, allowing them to communicate more effectively and build stronger relationships.