Pronunciation: [ɪnˌapɹəpˈə͡ʊ] (IPA)
Correct spelling for the English word "in-apropos" is [ɪnˌapɹəpˈə͡ʊ], [ɪnˌapɹəpˈəʊ], [ɪ_n_ˌa_p_ɹ_ə_p_ˈəʊ] (IPA phonetic alphabet).