Pronunciation: [mˈə͡ʊst θˈɛtɪk] (IPA)
Correct spelling for the English word "most thetic" is [mˈə͡ʊst θˈɛtɪk], [mˈəʊst θˈɛtɪk], [m_ˈəʊ_s_t θ_ˈɛ_t_ɪ_k] (IPA phonetic alphabet).
Correct spelling for most thetic