Pronunciation: [mˈə͡ʊst ɛkspˈi͡ətɪv] (IPA)
Correct spelling for the English word "most expiative" is [mˈə͡ʊst ɛkspˈi͡ətɪv], [mˈəʊst ɛkspˈiətɪv], [m_ˈəʊ_s_t ɛ_k_s_p_ˈiə_t_ɪ_v] (IPA phonetic alphabet).