Blikket hennes er rolig.

Because the base noun is et blikk, which is a neuter noun.

• et blikk = indefinite singular
• blikket = definite singular

So the -et ending is the Norwegian way of saying the with many neuter nouns. That is why there is no separate word for the in this sentence.

In Norwegian, definiteness is often built into the noun itself.

So instead of saying something like the glance, Norwegian commonly says blikket, where the ending already carries the meaning of the.

That is a very common pattern:

• et hus → huset
• en bil → bilen
• et blikk → blikket

That is one of the most common ways to express possession in Norwegian.

The pattern is:

definite noun + possessive

So:

• blikket hennes = her gaze / her look

This word order is very natural and extremely common in everyday Norwegian.

English learners often expect the possessive to come first, but Norwegian often puts it after the noun instead.

Yes, you can.

Both are possible:

• blikket hennes
• hennes blikk

But they do not feel exactly the same.

Blikket hennes is the more neutral, everyday pattern.

Hennes blikk can sound more literary, formal, or emphatic. It may be used when you want to highlight hers specifically, perhaps in contrast with someone else.

Also notice the grammar:

• blikket hennes
• hennes blikk

Not hennes blikket

When the possessive comes first, the noun normally does not take the definite ending.

Because sin / sitt / sine is a reflexive possessive. It is used when the possessor is the same as the subject of the clause.

In this sentence, the subject is blikket hennes, not she.

So sin does not fit here.

Compare:

• Hun senket blikket sitt = She lowered her own gaze
  Here, hun is the subject, so sitt is possible.

But in:

• Blikket hennes er rolig

the subject is blikket, so the sentence uses the ordinary possessive hennes.

Normally, Norwegian adjectives often change form depending on gender and number. But rolig belongs to a group of adjectives that usually do not add -t in the neuter singular.

So you get:

• en rolig person
• et rolig blikk
• blikket er rolig

This is normal for many adjectives ending in -ig.

The plural and definite form is rolige:

• rolige øyne
• det rolige blikket

It is a predicate adjective.

That means it comes after the verb er and describes the subject:

• Blikket hennes = subject
• er = verb
• rolig = predicate adjective

So rolig is not directly attached to the noun inside the noun phrase. It is describing the subject through the verb er.

Compare:

• Blikket hennes er rolig
  The gaze is calm.

• det rolige blikket hennes
  her calm gaze

In the second example, rolige is used attributively, directly before the noun.

Yes, completely normal.

This is the standard word order for a simple statement:

subject + verb + complement

So:

• Blikket hennes = subject
• er = verb
• rolig = complement

If you turned it into a yes-no question, the verb would come first:

• Er blikket hennes rolig?

That verb-second pattern is very important in Norwegian.

Not always exactly, but it overlaps a lot.

Blikk can mean things like:

• glance
• look
• gaze

In this sentence it suggests the expression or quality in her eyes, rather than just the physical act of looking for one second.

So the exact English word depends on context, but grammatically it behaves like an ordinary neuter noun.

A simple learner-friendly approximation is:

BLIK-ke hennes er ROO-lig

A few useful notes:

• blikket has a short vowel in the first syllable
• the kk is pronounced clearly
• hennes usually has stress on the first syllable
• rolig is often pronounced with a long o sound that is closer to oo

Pronunciation varies by dialect, but that approximation is a good starting point.

Yes, this sentence is standard Bokmål.

A Nynorsk version would more likely be:

Blikket hennar er roleg

So if you are learning Bokmål, the original sentence is the expected form.