umlautlessness en · NOUN
Etymology
From umlautless + -ness.
Meanings
-
(uncountable) The fact or state of not exhibiting any signs of phonological umlaut.
As noted, the weak suffix -ita (< -iða) loses its vowel in long stems, creating this pattern of umlautlessness in long-stem preterit forms.
2012, Joseph Salmons, A History of German, page 136: