This is the feature that gives Icelandic nouns their distinctive look. There is no separate word for "the" — definiteness is a suffix glued onto the end of the noun — and there is no word for "a/an" at all. So hestur by itself means "a horse," and "the horse" is hesturinn, with the article fused on. Even more striking: the suffix is itself declined, agreeing with the noun in gender, number and case, so a definite noun ends up showing its case twice. This page establishes the principle and the nominative-singular forms; the full case-by-case paradigms live on the dedicated pages.
No "a," no separate "the"
English uses two free-standing articles, "a" and "the." Icelandic uses neither as a separate word. Indefiniteness is simply the bare noun:
Ég sá hest í gær.
I saw a horse yesterday. 'hest' is just the bare noun — there is no word for 'a'.
Definiteness is marked by attaching the article to the end of the noun:
Hesturinn er brúnn.
The horse is brown. 'hestur' + the suffix '-inn' = 'hesturinn', the horse.
So the contrast English draws with two separate words — "a horse" / "the horse" — Icelandic draws by the absence or presence of a suffix: hestur / hesturinn.
The three genders in the nominative singular
The suffix differs by gender. Here are the indefinite/definite minimal pairs, one per gender, in the nominative singular:
| Gender | Indefinite ("a _") | Definite ("the _") | Suffix |
|---|---|---|---|
| Masculine | hestur | hesturinn | -inn |
| Feminine | borg | borgin | -in |
| Neuter | barn | barnið | -ið |
Hestur — hesturinn. Borg — borgin. Barn — barnið.
A horse — the horse. A city — the city. A child — the child. The nom. sg. suffixes: -inn (m.), -in (f.), -ið (n.).
Two spelling points to lock in now. The masculine suffix is -inn with a double n — hesturinn, not hesturin (the single-vs-double n question is its own minefield, see spelling/n-vs-nn). And the neuter suffix uses eth: -ið, written with ð, not "id" or "ith."
Borðið á eldhúsinu er nýtt.
The table in the kitchen is new. Neuter 'borð' → 'borðið' with eth; note also 'eldhúsið' (the kitchen) → dative 'eldhúsinu'.
The mechanism: decline first, then suffix
Here is the rule that makes the whole system make sense. To build a definite noun, you do two steps in order:
- First put the noun into its case and number form — exactly as if it were indefinite.
- Then attach the article, which is itself inflected to match that same gender, number and case.
The article is historically a worn-down form of the old demonstrative hinn ("that"), which is why it still declines like one. So the suffix is not a fixed tag; it changes shape with the case just as the noun does.
Watch what this means in the dative singular. The noun hestur has dative hesti; the article's dative form is -num; together:
Ég gef hestinum hey.
I give the horse hay. Dative 'hesti' (the noun) + '-num' (the dative article) = 'hestinum' — both parts are in the dative.
Break hestinum apart and you literally see the case marked twice: hesti (dative noun) + -num (dative article). The stem says "dative," and the suffix says "dative" again. This double marking is one of the most distinctive things about Icelandic, and it is exactly what trips up learners who treat the suffix as an unchanging label.
Liturinn á hestinum er fallegur.
The colour of the horse is beautiful. 'á' takes the dative, so the horse is 'hestinum' — case shown on both the stem (hesti-) and the suffix (-num).
Putting it together
Three genders, indefinite then definite, in the nominative — drill these as your anchors before tackling the full paradigms:
Maðurinn, konan og barnið ganga heim.
The man, the woman and the child walk home. Masculine 'maðurinn', feminine 'konan', neuter 'barnið' — the three definite suffixes side by side.
Bókin er á borðinu, og lyklarnir eru í vasanum.
The book is on the table, and the keys are in the pocket. Definite forms in several genders and cases: 'bókin' (f. nom.), 'borðinu' (n. dat.), 'lyklarnir' (m. pl.), 'vasanum' (m. dat.).
Common Mistakes
❌ Placing a separate article: 'inn hestur' or 'hinn hestur' for 'the horse'
Incorrect — there is no free-standing 'the'; the article is suffixed.
✅ hesturinn
The horse. The article is glued to the end.
❌ Adding a word for 'a': searching for an indefinite article before 'hestur'
Incorrect — Icelandic has no word for 'a/an'; the bare noun is already indefinite.
✅ Ég sá hest.
I saw a horse. The bare noun means 'a horse'.
❌ Leaving the suffix uninflected: 'á hesturinn' for 'on the horse'
Incorrect — 'á' takes the dative, so both noun and article must be dative.
✅ á hestinum
On the horse. Decline the noun (hesti-) AND the article (-num).
❌ Single n in the masculine suffix: 'hesturin'
Incorrect — the masculine nom. sg. suffix is '-inn' with double n.
✅ hesturinn
The horse. Masculine '-inn', double n.
❌ Writing the neuter suffix without eth: 'barnid' or 'barnith'
Incorrect — the neuter suffix is '-ið', written with the letter ð.
✅ barnið
The child. Neuter '-ið' with eth.
Key Takeaways
- Icelandic has no separate word for "the" and no word at all for "a/an" — the bare noun is indefinite.
- Definiteness is a suffix on the noun: nominative singular -inn (m.), -in (f.), -ið (n.) — hesturinn, borgin, barnið.
- The suffix is a worn-down form of the old demonstrative hinn and is itself declined for gender, number and case.
- Build a definite noun in two steps: decline the noun first, then suffix the matching article — so a definite noun marks its case twice (hesti + -num = hestinum).
- Mind the spelling: masculine -inn has a double n; neuter -ið uses eth (ð).
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Start learning Icelandic→Related Topics
- Definite vs Indefinite: There Is No 'a/an'A1 — Icelandic has a suffixed definite article but no indefinite article at all — a bare noun is already indefinite, so 'maður' is both 'man' and 'a man', and English 'a/an' is simply never translated.
- Definite Article: Masculine ParadigmA2 — The full case-by-case suffixed definite article on a masculine noun — hesturinn, hestinn, hestinum, hestsins / hestarnir, hestana, hestunum, hestanna — including the nom.sg fusion, the genitive -sins, and the double -um dative plural.