The word "bulliest" is spelled with two Ls even though it might seem like there should only be one. The sound "ull" is actually spelled with two Ls in English. The IPA phonetic transcription for "bulliest" is /ˈbʊliəst/. The first syllable is pronounced like the word "bull," and the second syllable is pronounced like the word "eest" with a slight "y" sound at the end. The spelling of English words can often be tricky, and a good knowledge of phonetics can help.