Here are some possibilities based on potential misspellings or similar-sounding words:
* "Yiddish" is a language spoken by Jewish people, primarily in Eastern Europe.
* "Yenta" is a Yiddish word for a gossipy woman, often used in a humorous or affectionate way.
* "Gentile" refers to a non-Jewish person.
* "Yankee" is a term used to refer to people from the northern United States, especially those from New England.
If you can provide more context or the full sentence where you encountered "yentilish," I might be able to give you a more accurate answer.