Icelandic Irregular Nouns

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Declensions of Icelandic irregular nouns

In Icelandic, some nouns follow a completely different declension pattern as the one you know. They take totally different forms and some are affected by I-shift. Here are the most common deviations, but this is by no means a full list:

nominative faðir 
accusative föður 
dative föður 
genitive föður 
nominative feður 
accusative feður 
dative feðrum 
genitive feðra
nominative móðir 
accusative móður 
dative móður 
genitive móður 
nominative mæður 
accusative mæður 
dative mæðrum
genitive mæðra
nominative tré 
accusative tré 
dative tré 
genitive trés
nominative tré 
accusative tré 
dative trjá(m) 
genitive trjá(a) 
nominative köttur 
accusative kött
dative ketti 
genitive kattar 
nominative kettir 
accusative ketti
dative köttum 
genitive katta 
nominative bók
accusative bók
dative bók
genitive bókar
nominative bækur 
accusative bækur 
dative bókum 
genitive bókar

The letters in parentheses are only added if the definite article is not being added.

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