Studying idiosyncrasies can be an interesting pursuit in understanding human behavior and personality. However, if you're looking for synonyms for "study at idiosyncrasy," there are a few options to consider. You could investigate eccentricities, peculiarities, or quirks, all of which describe individual traits that make someone unique. Alternatively, you may want to explore synonyms for the word "idiosyncrasy" itself, such as singularity, distinctiveness, or individuality. Regardless of which synonym you choose, delving into the intricacies of human behavior can be a fascinating and rewarding experience that can provide valuable insights and understanding.