Probabil ajung târziu.

Romanian often drops subject pronouns when the verb ending already makes the subject clear.

Here, ajung means I arrive / I get there. The ending tells you it is 1st person singular, so eu is not necessary.

You could say Eu probabil ajung târziu, but that sounds more emphatic, as if you are stressing I.

Ajung is the 1st person singular present indicative of the verb a ajunge.

So:

• eu ajung = I arrive / I get there / I reach
• tu ajungi = you arrive
• el/ea ajunge = he/she arrives

In this sentence, the form ajung is what tells us the hidden subject is I.

In Romanian, just like in English sometimes, the present tense can be used for a future meaning, especially in everyday speech when the situation is clear from context.

So Probabil ajung târziu is a natural, conversational way to say I’ll probably arrive late.

More explicit future versions are:

• Probabil voi ajunge târziu.
• Probabil o să ajung târziu.

These are also correct, but the original sentence sounds very normal and colloquial.

Probabil is an adverb here. It means probably and modifies the whole statement, not just one word.

So it expresses the speaker’s uncertainty:

• Ajung târziu. = I’m arriving late / I’ll arrive late.
• Probabil ajung târziu. = I’ll probably arrive late.

Yes, Romanian word order is fairly flexible, but some positions sound more natural than others.

The most neutral version is:

• Probabil ajung târziu.

You may also hear:

• Ajung probabil târziu.
  This is possible, but it can sound a bit less neutral or slightly more conversational/context-dependent.

• Ajung târziu, probabil.
  This sounds more like an afterthought: I’m arriving late, probably.

So for learners, Probabil ajung târziu is the safest and most natural pattern.

Târziu means late and functions as an adverb here.

In Romanian, adverbs like this often come after the verb, so:

• ajung târziu = I arrive late

That word order is very natural. Romanian does allow other orders, but they usually add emphasis or sound more marked.

Both can mean the same thing, but the style is different.

• Probabil ajung târziu
  More natural in everyday speech, lighter, more conversational.

• Probabil voi ajunge târziu
  More explicitly future, sometimes a bit more formal or careful.

You can also say:

• Probabil o să ajung târziu
  This is very common in spoken Romanian and is often the most everyday future form.

English often says I’ll get there late, but Romanian does not always need an equivalent of there.

The verb a ajunge can simply mean:

• to arrive
• to get there
• to reach

If the destination is understood from context, Romanian often leaves it unstated.

If you want to mention a destination, you can add it:

• Probabil ajung târziu la birou. = I’ll probably get to the office late.
• Probabil ajung târziu acolo. = I’ll probably get there late.

No. A ajunge has a few related meanings, depending on context.

It can mean:

• to arrive
• to get to
• to reach
• sometimes even to become in certain expressions

For example:

• Ajung acasă la 8. = I get home at 8.
• Ajung la gară imediat. = I’ll get to the station right away.
• A ajuns doctor. = He became a doctor.

In Probabil ajung târziu, the meaning is clearly arrive / get there late.

A rough pronunciation is tir-zew, but that is only approximate.

A few helpful points:

• â is a specifically Romanian vowel, pronounced deep in the center of the mouth.
• z is like the z in zoo.
• iu at the end forms a quick glide.

So târziu sounds roughly like tîr-ziu, with the stress on the second syllable.

If you want the whole sentence approximately:

• Probabil ajung târziu
  roughly: pro-BA-bil a-JOONG tîr-ZYOO

That is not exact, but it can help as a first guide.

Yes, in correct Romanian writing, diacritics are important.

The correct form is:

• târziu

You may sometimes see tarziu online or in informal typing, especially when someone does not use a Romanian keyboard, but that is not the standard spelling.

For learners, it is best to write the word with the proper diacritic: â.

Yes, that is grammatically possible, but it changes the feel a bit.

• Probabil ajung târziu. = neutral, natural
• Eu ajung probabil târziu. = puts more emphasis on I
• Eu probabil ajung târziu. = also possible, often with contrast or emphasis

So if you are just making a simple statement, the original sentence is the most natural choice.