Den skadde reagerer.

Because Norwegian normally uses den/det/de with a definite adjective phrase.

Here, skadde means injured, but it is being used like a noun: the injured one / the injured person.
So den skadde literally works like the injured one.

This pattern is very common:

• den unge = the young one / the young person
• de gamle = the old people
• det ukjente = the unknown

So in your sentence, den skadde is the subject.

It is originally an adjective, but here it is being used substantively—in other words, it is functioning like a noun.

So:

• en skadd person = an injured person
• den skadde = the injured person / the injured one

English does this too sometimes, as in the rich, the poor, or the injured.

Because after den/det/de, an adjective usually takes the definite/weak form, which often ends in -e.

Compare:

• en skadd mann = an injured man
• ei skadd kvinne = an injured woman
• et skadd dyr = an injured animal
• den skadde mannen = the injured man
• den skadde = the injured one / injured person

So skadd is the basic adjective form in many indefinite contexts, while skadde is the form used here because the phrase is definite.

Because den skadde is a more neutral, impersonal way to say the injured person.

Using han or hun would mean he or she, and that would require the person’s sex to be known and relevant.
But den skadde is common when:

• the person’s identity is unknown
• the wording is formal, medical, or report-like
• the focus is on the condition, not the individual

So this sentence sounds natural in contexts like emergency services, news reports, or medical descriptions.

Yes.

In this expression, den does not mean the person is male or female. It is part of the structure used with a definite adjective phrase.

So den skadde can refer to:

• a man
• a woman
• a person whose sex is unknown or unspecified

It is best understood as the injured person.

It is singular.

If it were plural, you would normally have:

• de skadde = the injured ones / the injured people

So:

• den skadde reagerer = the injured person reacts
• de skadde reagerer = the injured people react

Notice that reagerer stays the same, because Norwegian verbs do not change form for singular vs. plural.

Reagerer is the present tense of å reagere = to react.

Norwegian present tense is often formed by adding -r or -er to the infinitive stem:

• å reagere = to react
• reagerer = reacts / is reacting

In Norwegian, the present tense can often cover both English meanings:

• reacts
• is reacting

The exact meaning depends on context.

Yes, in standard modern Norwegian, verbs do not change according to the subject.

So you get:

• jeg reagerer = I react
• du reagerer = you react
• han reagerer = he reacts
• de reagerer = they react

That is why reagerer looks the same no matter who is reacting.

The word order is the normal Norwegian subject + verb order:

• Den skadde = subject
• reagerer = verb

So the sentence structure is straightforward:

Den skadde reagerer.
= The injured person reacts.

This is the standard order used in ordinary statements.

Yes, that form may also be seen.

In Bokmål, both skadd and skadet can occur, and that can lead to forms like:

• den skadde
• den skadede

However, den skadde is very common and natural.

So if you see skadede, it is not a completely different word in meaning here—it is just a related form. For a learner, den skadde is an excellent form to know and use.

It sounds somewhat formal, clinical, or report-like because of den skadde.

You might hear it in contexts like:

• first aid
• emergency response
• police or news reports
• medical situations

In casual everyday speech, people might more often say something with personen or use a name or pronoun if known. But den skadde reagerer is perfectly natural in the right context.