Hálsólin er rauð.

Because Icelandic very often forms compound nouns by joining words together instead of keeping them separate. So what might be expressed with two words in English is often a single word in Icelandic.

This is extremely common, and learning to recognize compounds is an important skill in Icelandic.

The ending -in is the definite article, meaning the.

In Icelandic, the is usually attached to the noun instead of standing as a separate word.

So:

• hálsól = an/indefinite form
• hálsólin = the ... / the definite form

English uses a separate word, but Icelandic usually adds the article to the end of the noun.

Er is the present tense of the verb vera, which means to be.

So here:

• er = is

This is one of the most common verbs in Icelandic, and it is irregular, so it is worth memorizing early.

Because Icelandic adjectives must agree with the noun they describe in gender, number, and case.

Here, the noun is feminine singular nominative, so the adjective also has to be feminine singular nominative:

• masculine: rauður
• feminine: rauð
• neuter: rautt

So rauð is the correct form to match hálsólin.

It is in the nominative case because it is the subject of the sentence.

In a sentence like this:

• hálsólin = subject
• er = verb
• rauð = predicate adjective

In Icelandic, predicate adjectives after vera also normally match the subject, so rauð is nominative too.

Because Icelandic usually expresses the by attaching it to the noun as a suffix.

So instead of something like:

• the X

Icelandic often has:

• X + article ending

That is why you see hálsólin rather than a separate article word before the noun.

No, this is a very normal Icelandic sentence pattern:

subject + verb + adjective

So:

• Hálsólin = subject
• er = is
• rauð = red

This is the standard, neutral way to say it. Icelandic can change word order for emphasis or style, but this version is the straightforward one.

A rough guide for an English speaker is:

• Hálsólin: the á sounds roughly like ow in now, and ó sounds roughly like o in go
• er: roughly like eh-r, with a tapped or rolled r
• rauð: starts with røy/roy-like sound, and ð is like the th in this

A few useful pronunciation notes:

• á and ó are different vowels from plain a and o
• au is a diphthong
• ð is voiced, like English th in this, not like th in thing
• Icelandic r is usually pronounced more strongly than in most English accents

In this sentence, rauð comes after the verb because it is a predicate adjective, not an adjective directly in front of the noun.

Compare the difference:

• after to be: Hálsólin er rauð = the noun is red
• directly before a noun: an adjective can stand with the noun in a noun phrase

So here rauð is not acting like a red X; it is acting like X is red.

Yes. In Icelandic, knowing a noun’s gender is very important, because it affects:

• adjective forms
• pronouns
• sometimes article and inflection patterns

Since hálsólin is feminine, the adjective must be rauð. If the noun were masculine or neuter, you would need a different adjective form.

So when learning Icelandic nouns, it is very helpful to learn them together with gender from the beginning.