Treif is a Yiddish word commonly used in Jewish dietary laws to denote food that is not kosher. While it is specific within the Jewish context, there are synonymous words in the English language that convey a similar meaning. One such term is "non-kosher," which refers to food that does not comply with the strict dietary requirements of Jewish law. Another synonym is "impure," indicating that the food is not clean or fit for consumption according to kosher guidelines. Lastly, "forbidden" can also be used to describe treif, emphasizing that the food is not permitted or allowed by religious dietary regulations.