Questions & Answers about Feiti kötturinn sefur.
Because feiti is the weak masculine nominative singular form of the adjective feitur (fat).
In Icelandic, adjectives change form to match the noun they describe. They agree with the noun in:
- gender
- number
- case
- and often definiteness
Here, kötturinn means the cat, so the noun is definite. With a definite noun, Icelandic normally uses the weak form of the adjective:
- feitur köttur = a fat cat
- feiti kötturinn = the fat cat
So feiti is used because the noun is masculine, singular, nominative, and definite.