Pronunciation: [ɹɪstˈa͡ɪnəs] (IPA)
Correct spelling for the English word "Restiness" is [ɹɪstˈa͡ɪnəs], [ɹɪstˈaɪnəs], [ɹ_ɪ_s_t_ˈaɪ_n_ə_s] (IPA phonetic alphabet).