The spelling of the word "art inactive" can be explained using the International Phonetic Alphabet (IPA). The first syllable, "art," is pronounced with an /ɑ:/ sound followed by a light /r/ sound. The second syllable, "in," is pronounced with an /ɪn/ sound similar to the word "insect." The final syllable, "active," is pronounced with an /æk/ sound and a strong stress on the first syllable. Overall, the spelling of "art inactive" accurately reflects its pronunciation using the IPA.