Bílstjórinn er ómeiddur.

Because Icelandic usually adds the definite article to the end of the noun.

• bílstjóri = driver
• bílstjórinn = the driver

So the -inn here is the masculine singular definite article in this form. English uses a separate word, the, but Icelandic often attaches it directly to the noun.

It is a compound noun:

• bíll = car
• stjóri = controller / operator / driver

So bílstjóri literally means something like car-driver. Compound words are very common in Icelandic.

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

Here, bílstjórinn is:

• masculine
• singular
• nominative

So the adjective also has to be masculine singular nominative:

• masculine: ómeiddur
• feminine: ómeidd
• neuter: ómeitt

That is why the sentence uses ómeiddur.

The prefix ó- often means un-, not, or non-.

So:

• meiddur = injured / hurt
• ómeiddur = uninjured / unharmed

It is a very common prefix in Icelandic.

Er is the 3rd person singular present form of vera, which means to be.

So here it means is.

A few common forms of vera are:

• ég er = I am
• þú ert = you are
• hann / hún / það er = he / she / it is
• við erum = we are
• þið eruð = you are
• þeir / þær / þau eru = they are

It is nominative singular.

That is because it is the subject of the sentence: the driver is the person being talked about.

The adjective is also in nominative because it is used with vera in a simple statement about the subject.

Grammatically, bílstjóri without -inn is a driver / driver, not the driver.

So:

• Bílstjórinn er ómeiddur = The driver is uninjured
• Bílstjóri er ómeiddur would sound more like A driver is uninjured or a more generic statement, depending on context

In many real situations, if you mean one specific driver, you would normally use bílstjórinn.

Because this is a predicate adjective.

In the sentence:

• Bílstjórinn = subject
• er = linking verb
• ómeiddur = adjective describing the subject

So the structure is like English:

• The driver is uninjured

If you put the adjective directly before the noun, you would be making it part of the noun phrase instead, which is a different structure.

The adjective would change to match the gender of the subject.

Examples:

• Konan er ómeidd. = The woman is uninjured.
• Barnið er ómeitt. = The child is uninjured.

And in the plural:

• Mennirnir eru ómeiddir. = The men are uninjured.
• Konurnar eru ómeiddar. = The women are uninjured.
• Börnin eru ómeidd. = The children are uninjured.

This agreement system is one of the most important things to notice in Icelandic.

A rough guide for an English speaker is:

• Bílstjórinn ≈ BEEL-styoh-rin
• er ≈ ehr
• ómeiddur ≈ OH-may-thur or OH-may-duhr, depending on accent and how narrowly you pronounce it

A few useful pronunciation notes:

• í is a long ee-like sound
• ó is like o in go, but usually more pure
• jó in stjóri has a styoh kind of sound
• ð is often like the th in this, though in some positions it can sound weaker
• stress in Icelandic normally falls on the first syllable of the word

You would change the verb er to var:

• Bílstjórinn var ómeiddur. = The driver was uninjured.

The adjective ómeiddur stays the same here because the subject is still masculine singular nominative. Only the tense of the verb changes.

Yes. It is a completely natural and straightforward sentence, especially in contexts like:

• news reports
• accident descriptions
• police or emergency updates

It sounds neutral and factual, much like The driver is uninjured in English.