Ευχαριστώ πολύ.

A common pronunciation is:

• Ευχαριστώ → ef-ha-ri-STO
• πολύ → po-LEE

Put the stress on the last syllable of each word: -στώ and -λύ.

A more IPA-like guide is [efxaristo poˈli] in careful modern Greek pronunciation.

By itself, Ευχαριστώ means thank you or I thank you.

Greek often uses a full verb where English uses a fixed expression like thanks or thank you. So even though the literal structure is verbal, you should learn it as the normal everyday way to say thank you.

πολύ means very much or a lot here.

So:

• Ευχαριστώ = Thank you
• Ευχαριστώ πολύ = Thank you very much

It makes the phrase warmer and stronger, but it is still completely normal and common in everyday speech.

It is neutral and polite, so it works in both formal and informal situations.

You can say it to:

• friends
• strangers
• shop staff
• teachers
• older people
• colleagues

It is one of the safest and most useful thank-you phrases in Greek.

Greek often leaves out subject and object pronouns when they are understood from context.

In English, I thank you includes both I and you, but in Greek:

• Ευχαριστώ already tells you the speaker is I
• the person being thanked does not have to be stated

If needed, Greek can add extra words, but normally Ευχαριστώ alone is enough.

Yes. Ευχαριστώ is the 1st person singular present tense form of the verb ευχαριστώ, meaning to thank.

So grammatically it literally means I thank. But in real usage, learners should treat it mainly as the standard expression thank you.

Yes, absolutely.

Both are common:

• Ευχαριστώ = Thanks / Thank you
• Ευχαριστώ πολύ = Thank you very much

The shorter version is perfectly natural. The longer one simply sounds a bit more emphatic or appreciative.

Usually you will hear:

• Ευχαριστώ πολύ

This is the most standard order.

You may also hear Πολύ ευχαριστώ, but that is not the usual everyday phrasing for learners to copy. Stick with Ευχαριστώ πολύ.

The written accents in Ευχαριστώ πολύ show which syllable is stressed:

• ευχαριστώ
• πολύ

Stress matters in Greek pronunciation, so the accents are important and should normally be written.

Only capitalization.

• Ευχαριστώ is capitalized because it starts the sentence.
• ευχαριστώ is the same word with a lowercase first letter.

The meaning and pronunciation do not change.

Yes. Some common ones are:

• Ευχαριστώ = Thank you
• Ευχαριστώ πολύ = Thank you very much
• Σ’ ευχαριστώ = I thank you / Thanks addressed more directly to one person
• Ευχαριστώ πάρα πολύ = Thank you very, very much

For a beginner, Ευχαριστώ and Ευχαριστώ πολύ are the most useful to master first.

Σ’ ευχαριστώ includes the object you more explicitly, with σ’ being a shortened form of σε.

It can sound a little more direct or personal, especially in conversation with one person. But in many everyday situations, Greeks simply say Ευχαριστώ.

So:

• Ευχαριστώ = very common, general
• Σ’ ευχαριστώ = also common, a bit more explicitly directed at you

Yes.

It is natural in:

• conversation
• text messages
• emails
• notes
• customer interactions

In very formal writing, people may choose longer polite expressions too, but Ευχαριστώ πολύ is still perfectly normal and widely understood.