Jackie-O is a nickname for Jacqueline Kennedy Onassis, a former First Lady of the United States. The term has been used to describe her iconic style, which included oversized sunglasses, pillbox hats, and tailored dresses. While "Jackie-O" is a popular nickname for her, there are other synonyms that could be used to describe her style and personality. Some of these synonyms include chic, elegant, sophisticated, timeless, and refined. Her fashion sense and grace have inspired generations of women, making her a true fashion icon. Whatever the word used to describe her, Jackie-O will always be remembered as a symbol of style and grace in the history of the US.