The spelling of the word "Tonelli" is rather straightforward when using the International Phonetic Alphabet (IPA) system. In IPA, "T" is pronounced as /t/, followed by "o" pronounced as /oʊ/, then "n" pronounced as /n/, "e" pronounced as /ɛ/, "l" pronounced as /l/, and "li" pronounced as /li/. Therefore, the full phonetic transcription of "Tonelli" would be /toʊˈnɛli/, with the stress falling on the second syllable. This transcription indicates that the word is composed of two syllables, with a long "o" sound and short "e" sound.