Pronunciation: [ˌʌndəlˈa͡ɪ] (IPA)
Correct spelling for the English word "underli" is [ˌʌndəlˈa͡ɪ], [ˌʌndəlˈaɪ], [ˌʌ_n_d_ə_l_ˈaɪ] (IPA phonetic alphabet).