The word "cavillously" is spelled with three syllables: /ˈkævəloʊsli/. The first syllable, "cav," is pronounced with a short "a" sound, followed by the letter "v." The second syllable, "il," is pronounced with a short "i" sound, followed by the letter "l." The third and final syllable, "ously," is pronounced with a long "o" sound, followed by the letter "u" and a final "s" sound. Overall, the spelling of "cavillously" accurately reflects its pronunciation.