Adjective Agreement: First Steps

In English an adjective is a fixed word: "good" is "good" whether it describes a man, a woman, a house, or a hundred of them. Icelandic does not work this way. An Icelandic adjective agrees with its noun — it changes its ending to match that noun's gender, number, and case. This is the single biggest adjustment for an English speaker, and it starts on day one, because even "I am tired" forces a choice. This page gives you the A1 entry point: agreement by gender, in the singular, using the predicate after vera ("be"). The complete declension tables (and the attributive forms before a noun) come later; the goal here is to make the basic reflex automatic.

The big idea: adjectives have three genders

Every Icelandic noun is masculine, feminine, or neuter, and an adjective describing it takes a matching form. Take góður ("good"). It is not one word but a set:

The basic singular endings are -ur (masc.) / -∅ (fem.) / -t (neut.). So "good" is góður for a masculine noun, góð for a feminine one, and gott for a neuter one. (In gott the stem-final ð assimilates to the -t ending and you get a doubled tt — a regular spelling effect you will see in several adjectives.)

Agreement after vera: "I am ..."

The clearest place to see agreement is the predicate — the adjective after the verb vera ("be"). Whatever the subject's gender is, the adjective matches it. Watch góður track three subjects:

Same English adjective, three Icelandic forms — chosen entirely by the gender of the thing described. This is also why a person describing themselves must pick a form by their own gender. A man says ég er þreyttur ("I'm tired"), a woman says ég er þreytt. The verb is identical; the adjective is not.

The three genders of "hungry": svangur / svöng / svangt

One more full set, because it shows a wrinkle worth meeting early. Svangur ("hungry") declines svangur (m.) / svöng (f.) / svangt (n.):

Notice the feminine svöng: the stem vowel a has rounded to ö. This is the same u-umlaut you meet in verbs (tölum) and nouns — here it is triggered by the feminine ending. You do not need to master where it applies yet; just don't be surprised that the feminine of an a-stem adjective often shows ö rather than plain a. And keep your eye on the neuter svangt: the -t is exactly the ending beginners drop.

Why the neuter -t matters so much

The neuter form earns special attention because it does double duty. Beyond describing neuter nouns, the neuter -t form is the one used in impersonal statements — sentences with the dummy subject það ("it"), where there is no real noun to agree with. "It's good," "it's cold," "it's difficult" all take the neuter:

So the neuter is not a rare corner of the grammar — it is the form behind every "it's ..." remark you will make daily. Drilling gott / kalt / erfitt (all with that final -t) early pays off across the whole language. Dropping the -t (það er góð) is the most common adjective error English speakers make, precisely because English has nothing to remind them an ending is required.

A first look at attributive use

Agreement is not only for the predicate. When an adjective sits directly in front of a noun (attributive position), it still agrees:

The attributive forms have their own complete system (the "strong" and "weak" declensions), which is a later topic. For now, simply notice that góður matur and gott veður use the same gender logic as the predicate: the adjective bends to the noun. Meeting it here, on two phrases, is enough — the full attributive tables are a separate page.

Common Mistakes

Leaving the adjective in a default shape (or guessing the gender) is the root error. Matur is masculine; its adjective must be góður.

The forgotten neuter -t. Every "it's ..." statement uses the neuter form: það er gott, það er kalt, það er erfitt.

The adjective agrees with the subject's gender. A man describing himself uses þreyttur; þreytt is the feminine (and neuter) form.

A feminine subject takes the feminine adjective. For svangur that is svöng (with the a→ö umlaut), not the masculine svangur.

Key Takeaways

• Icelandic adjectives agree with their noun — learn each one as a three-gender set: góður (m.) / góð (f.) / gott (n.).
• The basic singular endings are -ur (masc.) / -∅ (fem.) / -t (neut.).
• After vera, the predicate adjective matches the subject's gender, so a man says ég er þreyttur and a woman ég er þreytt.
• The neuter -t is the form learners drop most — and it is exactly the form used in impersonal "it's ..." statements (það er gott, það er kalt). Drill it.
• Feminine a-stem adjectives often show a→ö (svangur → svöng); attributive agreement (góður matur) follows the same gender logic, with full tables coming later.