The word "startlish" doesn't actually exist in the English language, but if it did, it would likely be spelled with two "t's" - "starttlish". Pronounced /ˈstɑr.tlɪʃ/, it would be a compound word made up of "start" and "fretful". While this word may not exist, it's important to pay attention to spelling in written communication. Incorrectly spelled words can lead to confusion and misinterpretation of what you are trying to convey.