Pronunciation: [mˈə͡ʊst ɹəbˈʌst͡ʃuːəs] (IPA)
Correct spelling for the English word "most robustuous" is [mˈə͡ʊst ɹəbˈʌst͡ʃuːəs], [mˈəʊst ɹəbˈʌstʃuːəs], [m_ˈəʊ_s_t ɹ_ə_b_ˈʌ_s_tʃ_uː_ə_s] (IPA phonetic alphabet).