Leikpeðið er rautt.

Because Icelandic adjectives must agree with the noun they describe.

In this sentence, leikpeðið is neuter singular, so the adjective rauður changes to the neuter singular form rautt.

A useful comparison is:

• rauður = masculine
• rauð = feminine
• rautt = neuter

So rautt is the form that matches leikpeðið.

Er means is.

It is the present-tense form of the verb vera, which means to be. So this sentence uses the very common pattern:

subject + er + adjective

just like English something is red.

In Icelandic, the definite article is usually attached to the end of the noun instead of being a separate word like English the.

So leikpeðið contains the noun plus the definite ending -ið, which is why it means the something, not just a something.

This is very normal in Icelandic:

• bare noun = indefinite
• noun + article ending = definite

If you wanted to look it up, you would usually search for the indefinite singular form, which is likely leikpeð.

The form in the sentence, leikpeðið, is the definite version. So a learner often needs to mentally remove the article ending to find the base form.

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

In a simple sentence like this, the thing being talked about is usually nominative. After the verb vera (to be), the adjective also matches the subject, which is why rautt is in the matching nominative neuter singular form.

Because rautt is not directly placed in front of the noun. It comes after er and works as a predicate adjective.

So this sentence means:

The X is red

not

the red X

That distinction matters in Icelandic. If you wanted to say the red X, the adjective would go before the noun and would take a different form, for example rauða leikpeðið.

So:

• Leikpeðið er rautt = the X is red
• rauða leikpeðið = the red X

In this sentence, yes. The pattern is:

Leikpeðið + er + rautt
subject + verb + adjective

That is very similar to English.

However, Icelandic word order is not always exactly the same as English in longer sentences. Icelandic is often described as a verb-second language in main clauses, so if another element comes first, the verb still usually stays in second position.

The letter ð is usually pronounced like the th in this, not like an English d.

So it is a voiced th sound. For English speakers, that is often one of the easiest ways to remember it:

• þ sounds like th in thing
• ð sounds like th in this

In natural speech, ð can sometimes sound quite soft.

Not exactly.

In Icelandic, tt often does not sound like a simple long English t. In many pronunciations it has a special sound, often described as a kind of pre-aspirated t. English speakers may hear something a bit like ht.

So rautt is not pronounced as if it were simple English raut-t. This is a normal Icelandic pronunciation feature, not something special about this one word.

Yes, very much.

The gender of the noun affects:

• the form of the adjective
• often the form of the definite article ending
• sometimes other words in the sentence too

This sentence is a good example, because you need to know that leikpeð is neuter in order to understand why the adjective is rautt and not another form.