In Old Norse, the weak plural forms of adjectives is "-u"(except for dative). This is the case in all genders, like how Common West Germanic forms seem to be "*-ōn".

What are the sound changes that led to this ending?

  • Given that the weak inflection generally followed the n-stems in Proto-Germanic and had a mixture of *-īn- and *-ōn- in the plural, I don’t think sound changes alone can explain the Old Norse forms. Inherently weak adjectives like fleiri have plural forms in -i rather than -u, which seems more like a reasonable outcome, but the productive weak inflection pattern is, I think, more down to analogy than sound change. Jun 17, 2023 at 13:20


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