Ævin er löng.

Ævi is the basic noun form, meaning life or lifetime.

Ævin is the definite form, roughly the life. In Icelandic, the definite article is usually added to the end of the noun instead of being a separate word.

So:

• ævi = life / a life
• ævin = the life

In this sentence, Icelandic uses the definite form.

Because Icelandic usually puts the onto the end of the noun as a suffix.

So instead of:

• English: the life

Icelandic says:

• ævin

That final -n is the definite article here.

This is a very common feature of Icelandic nouns.

This is a very common thing that surprises English speakers.

Icelandic often uses the definite form where English uses no article at all, especially in general statements or more abstract, literary, or proverbial-sounding sentences.

So Ævin er löng can correspond to English Life is long, even though Icelandic literally looks more like The life is long.

This is not a word-for-word match with English article usage.

Er means is.

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

So:

• vera = to be
• er = is

In Ævin er löng, it links the subject ævin with the description löng.

Yes. Löng is a form of the adjective langur, which means long.

Icelandic adjectives change form to match the noun they describe. Since ævi is a feminine singular noun, the adjective must also be in the matching form.

So:

• dictionary form: langur = long
• feminine singular nominative form: löng

That is why the sentence uses löng.

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

In a sentence like X is Y, the thing being talked about is normally in the nominative.

Here:

• Ævin = the subject
• er = is
• löng = predicate adjective

The adjective löng also matches the subject in gender, number, and usually case in this kind of sentence.

Because löng is not being used directly before the noun as an attributive adjective. It is being used as a predicate adjective after er.

Compare:

• löng ævi = a long life
  Here the adjective comes directly before the noun.

• Ævin er löng = Life is long / The life is long
  Here the adjective comes after er, just like in English: is long.

So the word order is normal.

Good question. Learners often expect a weak adjective form after a definite noun.

But in this sentence, löng is a predicate adjective, not an adjective directly attached to the noun. Predicate adjectives normally use the strong form.

So:

• hin langa ævi = the long life
  Here the adjective is directly modifying the noun, so a weak form appears.

• Ævin er löng = Life is long
  Here the adjective comes after er, so the strong form löng is used.

A rough English-friendly pronunciation is:

EYE-vin er lungk

A few notes:

• æ sounds roughly like eye
• v in ævin is pronounced clearly
• ö does not have an exact English equivalent; it is somewhat like the vowel in German ö
• ng in löng is pronounced like ng in sing, though the final sound may feel a little sharper to English ears

A more careful learner takeaway is:

• ævin ≈ EYE-vin
• er ≈ ehr
• löng ≈ something like lœng / lungk

They are related, but not always identical.

• líf often means life in a broad, everyday sense
• ævi often means lifetime, the course of someone’s life, or has a slightly more literary tone

So Ævin er löng can sound a bit more elevated or reflective than a sentence with líf.

For example:

• Lífið er stutt. = Life is short.
• Ævin er löng. = Life / A lifetime is long.

Depending on context, ævi can feel more like one’s whole life span.

Yes, it is grammatical and understandable, but it can sound somewhat literary, reflective, or proverb-like.

A learner should know that it is not just a random combination of words; it works well as a complete sentence. But in everyday speech, Icelanders might often choose other ways to talk about life depending on context.

So it is natural, but its tone may be a little more thoughtful or stylized than very plain everyday speech.