Το νερό είναι εξαιρετικά κρύο.

Το is the definite article, meaning the.

So:

• το νερό = the water

In Greek, articles are used very often, even in places where English might sometimes leave them out. With a noun like νερό (water), using το is completely normal.

Νερό is a neuter noun. One clue is its article:

• το = singular neuter the

Another clue is the ending:

• many neuter nouns end in -ο, though this is not a perfect rule

Because νερό is neuter singular, words that agree with it, like adjectives, also appear in the neuter singular form.

Greek adjectives must agree with the noun they describe in gender, number, and case.

The adjective κρύος / κρύα / κρύο means cold, and its form changes depending on the noun:

• κρύος = masculine
• κρύα = feminine
• κρύο = neuter

Since νερό is neuter singular, the correct form is:

• το νερό είναι κρύο

So κρύο is used because it matches νερό.

Είναι means is or are.

It is the present-tense form of the verb είμαι = to be.

In this sentence:

• Το νερό είναι εξαιρετικά κρύο.
• The water is extremely cold.

A useful point: είναι does not change for gender. The noun may be neuter, but the verb stays είναι.

Εξαιρετικά is an adverb here. It modifies the adjective κρύο and means something like:

• extremely
• exceptionally

So:

• εξαιρετικά κρύο = extremely cold

This is similar to how English uses very, extremely, or really before an adjective.

Yes. That would be very natural.

• πολύ κρύο = very cold
• εξαιρετικά κρύο = extremely cold / exceptionally cold

So the difference is mainly one of strength and style:

• πολύ is more common and everyday
• εξαιρετικά sounds a bit stronger and sometimes slightly more formal

Greek word order is more flexible than English, but not every change sounds equally natural.

The most neutral order here is:

• Το νερό είναι εξαιρετικά κρύο.

You might also hear emphasis-based variations, but for a learner, this standard order is best:

1. subject
2. verb
3. adverb + adjective

So if you are producing the sentence yourself, stick with:

• Το νερό είναι εξαιρετικά κρύο.

Normally, you should include το here.

• Το νερό είναι εξαιρετικά κρύο. = natural
• Νερό είναι εξαιρετικά κρύο. = not natural in standard Greek in this context

Greek usually wants the article with a noun like this when you mean the water or when speaking generally in a normal sentence.

So for learners, the safe choice is:

• use το νερό

A rough pronunciation is:

• to ne-RO EE-ne ek-se-re-ti-KA KRY-o

A slightly more careful breakdown:

• Το = to
• νερό = ne-RO
• είναι = often sounds like EE-ne
• εξαιρετικά = ek-se-re-ti-KA
• κρύο = KRY-o

The stressed syllables are:

• νερό
• εξαιρετικά
• κρύο

The written accent marks show you where the stress falls.

Because κρύο is pronounced as κρύ-ο, not as one syllable.

So it sounds like:

• KRY-o

This happens because the final -ιο / -ιο / -ο-type combinations in Greek can form separate syllables depending on the word. In κρύο, the ο is pronounced separately.

That is important for pronunciation and rhythm.

It can be both, depending on context.

In your sentence, κρύο is an adjective:

• το νερό είναι κρύο = the water is cold

But το κρύο can also be a noun meaning the cold or cold weather:

• Το κρύο είναι έντονο. = The cold is intense.

So the form is the same, but the function depends on how it is used in the sentence.

Yes, but the tone changes.

• κρύο = the normal everyday word for cold
• ψυχρό = more formal, technical, or literary; often cold in a more detached or scientific sense

For water, everyday Greek usually prefers:

• Το νερό είναι κρύο.

So κρύο is the best choice for normal conversation.