Pronunciation: [mˈə͡ʊst θˈɛtɪkə͡l] (IPA)
Correct spelling for the English word "most thetical" is [mˈə͡ʊst θˈɛtɪkə͡l], [mˈəʊst θˈɛtɪkəl], [m_ˈəʊ_s_t θ_ˈɛ_t_ɪ_k_əl] (IPA phonetic alphabet).