The spelling of the word "most insati" can be explained using the International Phonetic Alphabet (IPA). The word is pronounced /moʊst ɪnˈseɪti/. The first syllable "mo" is pronounced with the long "o" sound /moʊ/. The second syllable "st" is pronounced with a short "i" sound /ɪ/. The third syllable "in" is pronounced with a short "i" sound /ɪ/, while the fourth syllable "sa" is pronounced with a long "a" sound /ˈseɪ/. Lastly, the final syllable "ti" is pronounced with a short "i" sound /ti/. Overall, the word "most insati" is spelled following the pronunciation of each individual syllable.