Pronunciation: [fˈɒɹɪstjə͡l] (IPA)
Correct spelling for the English word "forestial" is [fˈɒɹɪstjə͡l], [fˈɒɹɪstjəl], [f_ˈɒ_ɹ_ɪ_s_t_j_əl] (IPA phonetic alphabet).