Havet er mektig.

In Norwegian, the definite article is usually attached to the end of the noun.

• hav = sea / ocean
• havet = the sea / the ocean

So -et is the definite ending here. Norwegian often does this instead of using a separate word like English the.

Because hav is a neuter noun, its definite singular form is -et:

• et hav = a sea / an ocean
• havet = the sea / the ocean

That is because hav is a neuter noun in Norwegian.

Norwegian nouns have grammatical gender, and in Bokmål the common patterns are:

• en noun → definite singular usually -en
• ei noun → definite singular usually -a
• et noun → definite singular usually -et

Since it is:

• et hav = a sea / an ocean

the definite form becomes:

• havet = the sea / the ocean

If it were a masculine noun, you would expect -en instead.

It can mean either sea or ocean, depending on context.

So havet can be understood as:

• the sea
• the ocean

In many cases, Norwegian hav is a broad word covering both ideas. The exact English translation depends on the situation.

Er means is / am / are, depending on context. It is the present tense of the verb å være = to be.

Examples:

• Jeg er trøtt. = I am tired.
• Du er snill. = You are kind.
• Havet er mektig. = The sea is mighty.

So here, er simply means is.

In this sentence, mektig is a predicative adjective. That means it comes after er and describes the subject:

• Havet = the sea
• er = is
• mektig = mighty / powerful

In Norwegian, predicative adjectives often agree with the noun, but adjectives ending in -ig usually do not add an extra -t in the neuter.

So you get:

• en mektig konge = a mighty king
• et mektig hav = a mighty sea
• Havet er mektig = The sea is mighty

So mektig stays mektig.

Yes, in standard Bokmål, mektigt would be wrong.

The correct form is mektig, even with a neuter noun like hav.

This is because adjectives ending in -ig normally do not take an extra neuter -t:

• et viktig spørsmål = an important question
• et mektig hav = a mighty sea

So:

• Havet er mektig. = correct
• Havet er mektigt. = not standard Bokmål

Mektig usually means powerful, mighty, or sometimes impressive in force or greatness.

With havet, it suggests something like:

• strong
• majestic
• overwhelming
• powerful in nature

So it does not just mean physical size. It gives the sea a sense of force and grandeur.

Because the sentence uses the definite noun havet = the sea, not the indefinite et hav = a sea / an ocean.

Compare:

• Et hav er mektig. = A sea is mighty.
  This sounds more general or unusual.
• Havet er mektig. = The sea is mighty.
  This sounds more natural as a statement about the sea.

So there is no word for a here because the sentence is not indefinite.

Yes. This is a very normal Norwegian sentence pattern:

• Subject + verb + adjective/complement

So:

• Havet = subject
• er = verb
• mektig = subject complement

This is the same basic pattern as in English:

• The sea is mighty.

A simple learner-friendly approximation is:

HAH-vet ær MEK-tih

A few helpful notes:

• Havet has two syllables: ha-vet
• er is often pronounced more lightly in natural speech
• g at the end of mektig is not pronounced like a strong English g in go

Pronunciation varies a bit by dialect, but that approximation is a good start.

Yes, you could, but it is not exactly the same word.

• havet = the sea / the ocean
• sjøen = the sea

In many contexts, both can work, but hav often feels broader or more open-ocean-like, while sjø can be more like sea in the ordinary sense.

So:

• Havet er mektig sounds broad, grand, and natural.
• Sjøen er mektig is possible too, but may feel a little different in tone or context.

Yes. It is short, grammatical, and natural. It sounds a bit literary or descriptive, because mektig is a strong, expressive adjective.

It is the kind of sentence you might see in:

• descriptive writing
• poetry
• nature writing
• dramatic speech

In everyday conversation, people might also choose adjectives like:

• sterkt in some contexts
• voldsomt for something more violent
• imponerende for impressive

But Havet er mektig is definitely good Norwegian.