Nu înțeleg deloc.

Romanian often leaves out the subject pronoun when it is already clear from the verb form. In înțeleg, the ending shows that the subject is I.

So:

• înțeleg = I understand
• eu înțeleg = I understand, but with extra emphasis on I

That means Nu înțeleg deloc naturally means I don’t understand at all, even without eu.

Nu is the basic word for negation in Romanian. It means not and goes before the verb.

So:

• înțeleg = I understand
• nu înțeleg = I do not understand / I don’t understand

This is the normal way to make a verb negative in Romanian.

Înțeleg is the 1st person singular present tense form of the verb a înțelege, which means to understand.

A few present-tense forms are:

• eu înțeleg = I understand
• tu înțelegi = you understand
• el/ea înțelege = he/she understands
• noi înțelegem = we understand
• voi înțelegeți = you all understand
• ei/ele înțeleg = they understand

So in your sentence, înțeleg specifically means I understand.

Deloc means at all in negative sentences. It strengthens the negation.

So:

• Nu înțeleg = I don’t understand
• Nu înțeleg deloc = I don’t understand at all

It adds emphasis and makes the sentence stronger.

Yes. Nu înțeleg is completely correct and very common.

The difference is:

• Nu înțeleg = neutral, simple statement
• Nu înțeleg deloc = stronger; I really don’t understand at all

So deloc is optional, but it adds emphasis.

That is the most natural position here. In Romanian, words like deloc often come after the verb phrase.

So:

• Nu înțeleg deloc sounds natural and standard.

You may sometimes see other word orders for emphasis in longer sentences, but for this short sentence, putting deloc at the end is the normal choice.

A simple learner-friendly pronunciation guide is:

noo ihn-tseh-LEG deh-LOK

A few helpful points:

• nu sounds like noo
• în has a central vowel sound that English does not have exactly
• ț is pronounced ts
• g in înțeleg is a hard g, like in go
• deloc has stress on the last syllable: de-LOC

The trickiest part for English speakers is usually the vowel written î/â.

The letter î represents a Romanian vowel that does not exist naturally in English. It is a close central vowel, often explained as a tight, central sound made with the tongue high in the mouth.

For a beginner, the most important thing is:

• do not pronounce it exactly like English ee
• do not pronounce it exactly like oo
• keep it short and central

Also, înțeleg begins with în-, and many learners first approximate it as something like uhn or ihn. That is not perfect, but it is a reasonable starting point.

It is neutral and works in both formal and informal situations.

You can say it:

• to a friend
• in class
• to a stranger
• in a shop or office

If you want to sound a little softer or more polite, you could say:

• Nu prea înțeleg. = I don’t really understand.
• Nu înțeleg foarte bine. = I don’t understand very well.

But Nu înțeleg deloc itself is perfectly normal and not rude.

Most often, yes. Deloc is very commonly used with a negative verb, where it means at all.

For example:

• Nu-mi place deloc. = I don’t like it at all.
• Nu știu deloc. = I don’t know at all
• Nu înțeleg deloc. = I don’t understand at all

So as a learner, it is safest to think of deloc as a word that usually appears with negation.

No, it is not wrong. It is grammatically correct.

Adding eu gives extra emphasis, something like:

• I don’t understand at all

So:

• Nu înțeleg deloc = normal, natural
• Eu nu înțeleg deloc = more emphatic

Romanian often omits subject pronouns unless there is a reason to stress them.

Yes. Another common verb is a pricepe, which can also mean to understand, especially in everyday speech.

For example:

• Nu pricep deloc. = I don’t understand at all

But a înțelege is the most standard and widely useful verb to learn first. Nu înțeleg deloc is an excellent basic sentence.