Dan. lygn adj. “pale”
An adjective for “pale” developed from primitive ᴹ✶lugni (Ety/LUG²). It seems that this word underwent i-mutation of [u] to [y], as in the plural yrc of Dan. urc. However, it is known that short final [i] became [e] in Common Eldarin, so that ᴹ✶lugni became ᴹ✶lugne before the divergence of these languages, making the i-mutation difficult to explain (as noted by Helge Fauskanger, AL-Nandorin/lygn). One possible explanation is that the short final [ĕ] either reverted to [i] or did not change in the first place in the Danian branch of Eldarin.
See Dan. (unstressed or final?) [ĕ] became [i] for further discussion.
Reference ✧ Ety/LUG² ✧ “pale”
|ᴹ✶lugni > lygn||[lugni] > [lugne] > [lugni] > [lygni] > [lygn]||✧ Ety/LUG²|