Lojaliteten er viktig.

Lojaliteten is the definite singular form of lojalitet.

• lojalitet = loyalty
• lojaliteten = the loyalty

In Norwegian, the definite article is often added to the end of the noun instead of being a separate word in front.

So:

• en lojalitet = a loyalty
• lojaliteten = the loyalty

That final -en is the definite ending here.

Because Norwegian usually builds the into the noun itself.

In English, you say:

• the loyalty

In Norwegian, you usually say:

• lojaliteten

This is very common in Norwegian. The noun itself carries the idea of the.

Because viktig is describing a singular subject, and it comes after er as a predicative adjective.

Here:

• Lojaliteten = singular
• er = is
• viktig = important

So the basic pattern is:

• singular subject + er
  • adjective in basic form

Examples:

• Boken er viktig. = The book is important.
• Huset er stort. = The house is big.

You would use viktige for plural in many cases:

• Bøkene er viktige. = The books are important.

Good question. In Norwegian, adjectives work differently depending on where they are in the sentence.

Here, viktig comes after the verb er, so it is a predicative adjective. Predicative adjectives do not take the definite form just because the noun is definite.

So:

• Lojaliteten er viktig. = correct

Compare that with an adjective before a noun, where definite marking does matter:

• den viktige lojaliteten = the important loyalty

So:

• before the noun: adjective changes for definiteness
• after er/blir/virker, etc.: adjective usually stays in the normal predicative form

Er means is / are and is the present tense of å være (to be).

So:

• jeg er = I am
• du er = you are
• han er = he is
• lojaliteten er viktig = the loyalty is important

Unlike English, Norwegian uses the same form er for all persons in the present tense.

Yes, and that changes the nuance.

• Lojalitet er viktig. = Loyalty is important.
  This sounds like a general statement about loyalty as a concept.

• Lojaliteten er viktig. = The loyalty is important.
  This usually refers to a more specific loyalty, or to loyalty already understood from context.

So if you are talking in general, Lojalitet er viktig is often more natural. If you are referring to a particular loyalty, Lojaliteten er viktig fits better.

The word order is very standard:

• Lojaliteten = subject
• er = verb
• viktig = adjective / subject complement

So the pattern is:

• Subject + verb + complement

This is the same basic order as in English:

• The loyalty is important.

Lojalitet is a masculine noun in Bokmål.

So its forms are:

• en lojalitet = a loyalty
• lojaliteten = the loyalty
• lojaliteter = loyalties
• lojalitetene = the loyalties

For a learner, the most useful forms to remember are usually:

• en lojalitet
• lojaliteten

A helpful approximate pronunciation is:

• lo-ya-li-TE-ten

A few things to notice:

• the j in loja- sounds like English y
• the stress falls mainly on te
• the final -en is a common definite ending

So it does not sound like English j in job.

Yes, viktig is a very common adjective meaning important.

Examples:

• Det er viktig. = It is important.
• Boken er viktig. = The book is important.

If you want to say important to someone, Norwegian often uses viktig for:

• Lojaliteten er viktig for henne. = The loyalty is important to her.

So viktig is a very useful everyday word.

It is perfectly grammatical, but by itself it can sound a little formal or context-dependent.

In real conversation, people might more often say:

• Lojalitet er viktig. = Loyalty is important.
• Det er viktig å være lojal. = It is important to be loyal.

Still, Lojaliteten er viktig is natural if you are talking about a specific kind of loyalty already mentioned, for example in a discussion about work, friendship, or politics.