Nu sunt deloc obosit.

Nu is the normal Romanian word for not. It usually goes directly before the conjugated verb.

So:

• sunt = I am
• nu sunt = I am not

That is why the sentence begins with Nu sunt...

Sunt is the 1st person singular form of the verb a fi = to be.

So in this sentence:

• sunt = am
• nu sunt = am not

Romanian often leaves out the subject pronoun, so sunt by itself already tells you the subject is I.

Romanian is a pro-drop language, which means subject pronouns are often omitted when the verb form already shows who the subject is.

So both are possible:

• Nu sunt deloc obosit.
• Eu nu sunt deloc obosit.

The version without eu is more neutral and natural in many situations.

You would add eu mainly for emphasis or contrast, for example:

• Eu nu sunt deloc obosit, dar el este.
  = I’m not tired at all, but he is.

Deloc means at all, not at all, or in the least, depending on context.

In this sentence, it strengthens the negation:

• Nu sunt obosit. = I’m not tired.
• Nu sunt deloc obosit. = I’m not tired at all.

So deloc adds emphasis.

In normal modern Romanian, deloc is usually used with negation.

So the standard pattern is:

• nu ... deloc

Examples:

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

Using deloc without nu is generally not the normal everyday pattern for this meaning.

Here deloc modifies the whole idea of being tired, so it fits naturally before the adjective:

• Nu sunt deloc obosit.

This is the most natural and neutral word order.

You may also hear:

• Nu sunt obosit deloc.

That is understandable too, but Nu sunt deloc obosit is the most standard and common phrasing for a learner to use.

Obosit is the masculine singular form of the adjective/past-participle meaning tired.

Romanian adjectives agree with the person or thing they describe.

So:

• obosit = masculine singular
• obosită = feminine singular

That means:

• a male speaker would usually say Nu sunt deloc obosit.
• a female speaker would usually say Nu sunt deloc obosită.

Yes, in standard Romanian, if the speaker is female, the adjective should agree in gender:

• Nu sunt deloc obosită.

If the speaker is male:

• Nu sunt deloc obosit.

This is a very important agreement pattern in Romanian.

Yes. In this sentence, obosit functions like an adjective after the verb a fi.

So the structure is:

• Nu = negation
• sunt = verb
• deloc = adverb
• obosit = adjective

It works much like English I am tired.

Yes. Nu-s is a common contracted spoken form of nu sunt.

So these mean the same thing:

• Nu sunt deloc obosit.
• Nu-s deloc obosit.

The full form nu sunt is safer for learners and more neutral in writing. The contracted form nu-s is very common in speech and informal writing.

In standard Romanian, sunt is commonly pronounced roughly like soont, with u similar to the vowel in put but often a bit tenser and shorter depending on accent and speech.

A few useful pronunciation notes:

• nu sounds roughly like noo
• sunt sounds roughly like soont
• deloc sounds roughly like deh-LOK
• obosit sounds roughly like o-bo-SEET

The stress is usually:

• deloc
• obosit

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

• In conversation: perfectly natural
• In writing: also perfectly fine

If anything, the only part that changes with register is the possible contraction:

• Nu sunt deloc obosit. = neutral, standard
• Nu-s deloc obosit. = more informal/spoken

Sometimes, depending on context, obosit can overlap with tired, weary, or even something close to sleepy, but its core meaning is tired.

If you specifically want sleepy, Romanian more often uses:

• somnoros = sleepy
• mi-e somn = I’m sleepy / I feel sleepy

So Nu sunt deloc obosit most naturally means I’m not tired at all.

The pattern is:

nu + form of a fi + deloc + adjective

So you can build similar sentences such as:

• Nu sunt deloc fericit. = I’m not happy at all.
• Nu sunt deloc sigur. = I’m not at all sure.
• Nu sunt deloc pregătit. = I’m not at all ready.

This makes Nu sunt deloc obosit a very useful model sentence.