Jobben er slitsom.

Because jobben is the definite singular form of jobb.

• en jobb = a job
• jobben = the job

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

So:

• Jobben er slitsom = The job is tiring

Depending on context, it can also sound like My job is tiring, since Norwegian often uses the definite form where English might prefer a possessive.

Jobb is normally a common gender noun in Norwegian, so it takes en in the indefinite singular:

• en jobb
• jobben

This matters because the gender affects which article and endings are used. For example:

• en jobb → jobben
• plural: jobber → jobbene

In this sentence, the important thing is that jobben is the definite singular form of a common-gender noun.

Because Norwegian usually puts the definite article at the end of the noun.

Compare:

• English: the job
• Norwegian: jobben

That -en ending is doing the job of the here.

This is one of the biggest structural differences from English.

Slitsom is an adjective. It means something like:

• tiring
• exhausting
• draining
• sometimes wearing

It describes something that causes tiredness or takes energy from you.

So Jobben er slitsom means the job is something that makes you tired.

This is a very common learner question.

• slitsom = something is tiring / exhausting
• sliten = someone is tired / worn out
• trøtt = sleepy / tired

So:

• Jobben er slitsom = The job is tiring
• Jeg er sliten = I am tired / worn out
• Jeg er trøtt = I am sleepy / tired

A good way to remember it:

• slitsom describes the cause
• sliten describes the result

So the job is slitsom, and the person becomes sliten.

Because it is being used predicatively, meaning it comes after er and describes the subject.

In Jobben er slitsom, the subject is singular and common gender, so the basic form slitsom is correct.

Compare:

• Jobben er slitsom
  common gender singular

• Arbeidet er slitsomt
  neuter singular

• Jobbene er slitsomme
  plural

So the adjective does change in Norwegian, but the form depends on the noun it describes.

Yes. With a neuter singular noun, many adjectives take -t.

For example:

• et arbeid = a piece of work / work
• Arbeidet er slitsomt = The work is tiring

So:

• common gender singular: slitsom
• neuter singular: slitsomt
• plural/definite adjective situations: slitsomme

That is why jobben er slitsom has slitsom, not slitsomt.

The structure is:

• Jobben = subject
• er = verb
• slitsom = adjective/complement

So it follows a very familiar pattern for English speakers:

• The job
  • is
    • tiring

This makes it a straightforward Norwegian sentence.

You switch the verb and subject:

• Er jobben slitsom? = Is the job tiring?

This is standard Norwegian word order for yes/no questions.

Statement:

• Jobben er slitsom.

Question:

• Er jobben slitsom?

Yes, very often it can, depending on context.

In natural Norwegian, people frequently use the definite form where English might use a possessive. So if someone is talking about their own situation, jobben can naturally be understood as my job.

For example:

• Jobben er slitsom for tiden.
  This could very naturally mean My job is tiring at the moment.

If you want to make the possessive completely explicit, you can say:

• Jobben min er slitsom. = My job is tiring.

A rough guide is:

• jobben ≈ YOB-ben
• er ≈ a short air-like sound, often weaker in normal speech
• slitsom ≈ SLEET-som

A more careful rough English-style approximation could be:

• YOB-ben er SLEET-som

A few notes:

• j in Norwegian is pronounced like English y
• o in jobb is short
• the stress is mainly on the first syllable of jobben and slitsom

Exact pronunciation varies a bit by dialect, but this approximation is a good start.