Pronunciation: [mˈə͡ʊst fɹʌstˈe͡ɪni͡əs] (IPA)
Correct spelling for the English word "most frustaneous" is [mˈə͡ʊst fɹʌstˈe͡ɪni͡əs], [mˈəʊst fɹʌstˈeɪniəs], [m_ˈəʊ_s_t f_ɹ_ʌ_s_t_ˈeɪ_n_iə_s] (IPA phonetic alphabet).