The spelling of the word "most nonactive" follows the basic rules of English phonetics. The sound /m/ at the beginning is followed by the vowel sound /oʊ/ in "most" and then the consonant sound /n/ in "non." The word "active" ends on a consonant sound /t/ and begins with a vowel sound /æ/. The two words are combined with the use of a hyphen. The correct way to pronounce "most nonactive" would be /moʊst/ /nɑːn/ /ˈæktɪv/ with emphasis on the second syllable in each word.