Útblásturinn er mikill.

It breaks down as:

• útblástur = exhaust, emission, or blowing out
• -inn = the attached definite article, meaning the

So útblásturinn means the exhaust or the emissions, depending on context.

In Icelandic, the is often attached to the end of the noun instead of being a separate word.

Because Icelandic usually puts the definite article onto the noun itself.

So instead of:

• the exhaust

you get:

• útblásturinn

This is very common in Icelandic. The ending changes depending on the noun’s gender, number, and case.

The dictionary form is útblástur = exhaust
The definite nominative singular form is útblásturinn = the exhaust

Because mikill has to agree with útblásturinn in gender, number, and case.

Here, útblásturinn is:

• masculine
• singular
• nominative

So the adjective also appears in the matching form:

• mikill = masculine singular nominative

Compare:

• mikill = masculine
• mikil = feminine
• mikið = neuter

So the form is chosen by grammar, not by the English translation.

Because mikill here is a predicate adjective, not an adjective directly in front of the noun.

In other words, this sentence has the structure:

• The exhaust
  • is
    • great/large/heavy

In Icelandic, predicate adjectives after vera (to be) usually stay in the normal agreeing form, not the weak definite form you would use before a noun.

So:

• Útblásturinn er mikill. = The exhaust is great/heavy/large.

But when an adjective comes directly before a definite noun, the pattern is different.

Er means is.

It is the 3rd person singular present tense of vera = to be.

So:

• ég er = I am
• þú ert = you are
• hann/hún/það er = he/she/it is

In Útblásturinn er mikill, er links the subject (útblásturinn) with the description (mikill).

It is in the nominative singular.

Why?

Because it is the subject of the sentence. In Icelandic, subjects are usually in the nominative case.

Also, the adjective mikill matches that nominative singular masculine form.

So the sentence is grammatically:

• útblásturinn = nominative singular masculine
• mikill = nominative singular masculine

The dictionary form is útblástur.

That is the indefinite singular nominative form, the form you would usually look up in a dictionary.

So:

• útblástur = exhaust / emission
• útblásturinn = the exhaust / the emission

This is a useful habit in Icelandic: when you see a noun with an ending like -inn, try to identify the base noun underneath.

Mikill is a very common Icelandic adjective that often means something like:

• big
• great
• large
• much
• considerable
• heavy or severe, depending on context

In this sentence, with útblástur, it usually suggests:

• a lot of exhaust
• heavy emissions
• considerable exhaust

So even though the literal structure is The exhaust is great/large, the natural meaning is often closer to There is a lot of exhaust or The emissions are heavy.

Context matters a lot with mikill.

A rough guide for English speakers is:

• Út- like oot
• blás- like blouse without the final e, but with a clear s
• -turinn roughly tu-rin
• er like ehr
• mikill roughly MIH-kitl or MIH-kill, depending on speaking style

A few pronunciation notes:

• ú is a long rounded vowel, roughly like oo but often more fronted than in English
• á sounds like ow in cow
• ll in Icelandic does not always sound like English ll; in many words it has a special pronunciation, though learners often approximate it at first
• the stress is normally on the first syllable of each word: ÚT-blásturinn er MI-kill

A learner approximation is perfectly fine at the start.

Yes, but Útblásturinn er mikill is the normal, straightforward order.

This is the basic pattern:

• Subject + verb + complement

You may sometimes see other word orders for emphasis or in questions, but this version is the neutral statement.

For example, Icelandic can move things around more than English, but beginners should treat Útblásturinn er mikill as the standard form to learn first.

It is singular here.

• útblásturinn = the exhaust / the emission output

But singular nouns in Icelandic, just like in English, can sometimes refer to something general or collective depending on context.

So this could mean:

• the exhaust from one vehicle or machine
• exhaust output in general
• emissions, in a broad sense

The exact English wording depends on context, even though the Icelandic form here is singular.

Yes — this sentence is a very good example of a core Icelandic rule:

Adjectives must agree with the noun they describe.

Here that means:

• noun: útblásturinn

  • masculine
  • singular
  • nominative

• adjective: mikill

  • masculine
  • singular
  • nominative

This agreement is one of the biggest differences from English. In English, big stays big no matter what noun follows. In Icelandic, the adjective changes form depending on the noun.

So this sentence is a nice model for the pattern:

• [masculine singular nominative noun] + er + [masculine singular nominative adjective]