Most inundatory is a rare word that refers to something that is most likely to cause flooding. The correct spelling of this word is /məʊst ɪnʌnˈdeɪtəri/. The IPA phonetic transcription reveals that the first syllable is pronounced with a schwa sound followed by a long "o" sound. The rest of the word is pronounced with a stress on the third syllable, where the "u" is pronounced as a short "u" sound followed by a stress on the fourth syllable with an "a" pronounced as a short "a" sound. The final syllable is pronounced using the suffix "-ary" with a stress on the second-to-last syllable.