Pronunciation: [stˌaɡnɪˈuːnəz] (IPA)
Correct spelling for the English word "stagniunas" is [stˌaɡnɪˈuːnəz], [stˌaɡnɪˈuːnəz], [s_t_ˌa_ɡ_n_ɪ__ˈuː_n_ə_z] (IPA phonetic alphabet).