The spelling of the word "IEST" may seem odd at first glance, but it is actually a suffix used to form the superlative form of certain adjectives (e.g. "tallest," "smartest"). In IPA phonetic transcription, "IEST" would be represented as /ist/, with the "i" sounding like the "i" in "bit" and the "st" sounding like "st" in "fast." So next time you come across the word "IEST," don't be alarmed – it's just a way to make an adjective even more descriptive!