Correct spelling for the English word "more impostrous" is [mˈɔːɹ ɪmpˈɒstɹəs], [mˈɔːɹ ɪmpˈɒstɹəs], [m_ˈɔː_ɹ ɪ_m_p_ˈɒ_s_t_ɹ_ə_s] (IPA phonetic alphabet).
The word "impostrous" does not have an established etymology. It is likely a combination of the negative prefix "im-" and the word "monstrous", meaning extraordinary or abnormal. The prefix "im-" is often used to negate or imply the opposite of a word, while "monstrous" comes from the Latin "monstruosus", meaning "unnatural" or "abnormal". Therefore, "impostrous" can be understood as meaning "not monstrous" or "less abnormal". However, it is worth noting that "impostrous" is not a widely recognized or commonly used word in contemporary English, so its etymology is not extensively studied or documented.