Pronunciation: [ˈʌn djˈuːə] (IPA)
Correct spelling for the English word "un duer" is [ˈʌn djˈuːə], [ˈʌn djˈuːə], [ˈʌ_n d_j_ˈuː_ə] (IPA phonetic alphabet).
Correct spelling for un duer