Pronunciation: [ɹɪθθˈa͡ɪ] (IPA)
Correct spelling for the English word "reththy" is [ɹɪθθˈa͡ɪ], [ɹɪθθˈaɪ], [ɹ_ɪ_θ_θ_ˈaɪ] (IPA phonetic alphabet).