Pronunciation: [dʌθ ðə slˈa͡ɪ] (IPA)
Correct spelling for the English word "doth the sly" is [dʌθ ðə slˈa͡ɪ], [dʌθ ðə slˈaɪ], [d_ʌ_θ ð_ə s_l_ˈaɪ] (IPA phonetic alphabet).