The spelling of the word "in cautiousnesses" can be quite tricky because it contains several long vowel sounds and multiple consonant clusters. To break it down using IPA phonetic transcription: /ɪn ˈkɔːʃəsnəsɪz/. The first syllable begins with the short i sound, followed by the long o sound in cautious. The -nesses ending has a schwa sound (ə) before the long e sound. The final syllable, -iz, ends with a voiced s sound. Keeping these elements in mind can help with proper spelling of this word.