The correct spelling of the word is "in submissions," not "insubmissions." The two words should be separated to avoid confusion. The pronunciation of "in submissions" is /ɪn səbˈmɪʃənz/, with the main stress on the second syllable of "submissions." The first syllable, "in," is pronounced with a short "ih" sound, and the second syllable, "sub," is pronounced with a short "uh" sound. The final syllable, "-ions," is pronounced with a schwa followed by the nasal "n" sound.