Pronunciation: [ɑːkˈe͡ɪɪktwˌiːni] (IPA)
Correct spelling for the English word "Archaictweeny" is [ɑːkˈe͡ɪɪktwˌiːni], [ɑːkˈeɪɪktwˌiːni], [ɑː_k_ˈeɪ_ɪ_k_t_w_ˌiː_n_i] (IPA phonetic alphabet).