The word "faddest" is spelled with two d's in the middle of the word. The IPA phonetic transcription for this word is /ˈfædəst/. The first syllable is pronounced with a short "a" sound, the second syllable with a schwa sound, and the final syllable with a "st" sound. "Faddest" is the superlative form of the adjective "faddish," which means something that is currently popular but will soon go out of fashion. This word is not commonly used in modern English.