The word "most insomnious" is spelled with the IPA phonetic transcription /məʊst ɪnˈsɒmniəs/. The initial "m" sound is followed by the "oh" sound, represented by the symbol /əʊ/. The second syllable starts with the "ih" sound, represented by /ɪ/, followed by the "n" sound, represented by /n/, and ending with the "s" sound, represented by /s/. Finally, the last syllable starts with the "oh" sound, represented by /ə/, followed by the "m" sound, represented by /m/ The word translates to "having the most insomnia" and is not commonly used in everyday language.