Questions & Answers about Koddinn er þægilegur.
In Icelandic the definite article is not a separate word but a suffix on the noun. For masculine nouns in the nominative singular you add -inn.
• koddi = “pillow” (indefinite)
• koddi + -inn → koddinn = “the pillow”
The dictionary (lemma) form is koddi (indefinite nominative singular). Icelandic does not use a separate word for “a,” so “a pillow is comfortable” becomes:
Koddi er þægilegur.