411 REFERENCE · Wikibooks
Old Norse/Grammar/Adjectives and Adverbs
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+ Strong Adjective Declension Singular PluralCaseMasculineNeuterFeminineMasculineNeuterFeminineNominative -r -t -(u-umlaut) -ir -(u-umlaut) -arGenitive -s -s -rar -ra -ra -raDative -um -u -ri -um -um -umAccusative -an -t -a -a -(u-umlaut) -ar
+ Weak Adjective Declension Singular PluralCaseMasculineNeuterFeminineMasculineNeuterFeminineNominative -i -a -a -u -u -uGenitive -a -a -u -u -u -uDative -a -a -u -um -um -umAccusative -a -a -u -u -u -u
Note the weak declension here, neuter is always 'a.' Masculine is 'i' in the nominative, but 'a' elsewise. The plural is 'u' except the dative 'um' ending.