Produsul este defect.

Because -ul is the Romanian definite article, attached to the end of the noun.

• produs = a product
• produsul = the product

Unlike English, Romanian usually puts the at the end of the noun instead of before it.

Este means is. It is the 3rd person singular form of the verb a fi = to be.

So here:

• produsul = the product
• este = is
• defect = defective / faulty

This is the most neutral and natural Romanian word order for a simple statement:

• subject: produsul
• verb: este
• predicate adjective: defect

Romanian word order is often flexible, but Produsul este defect is the standard, straightforward way to say it.

Here defect is an adjective, meaning defective, faulty, or broken in some way.

It can describe something that has a flaw or does not work properly.

Be careful: in English, defect is often a noun, but in Romanian defect can function as an adjective in this kind of sentence.

Romanian commonly uses defect as the normal adjective for faulty / defective in everyday language, especially for objects or products.

So:

• Produsul este defect. = The product is defective.

Defectiv exists, but defect is much more natural in this context.

Yes. Romanian adjectives usually agree with the noun in gender and number.

Here, produsul is masculine singular, so the adjective is also masculine singular:

• produsul este defect = masculine singular

If the noun changed, the adjective might change too:

• marfa este defectă = the merchandise is defective
  (defectă = feminine singular)
• produsele sunt defecte = the products are defective
  (defecte = plural)

A simple approximate pronunciation is:

pro-DOO-sul ES-te de-FEKT

A few notes:

• u is like oo in food, but usually shorter
• e is like e in bed
• c in defect is pronounced like k
• stress is roughly:
  • proDUsul
  • ESte
  • deFECT

Normally, in standard Romanian, no. In a full sentence like this, you usually keep este.

• correct: Produsul este defect.
• not standard as a full sentence: Produsul defect.

You might see shortened forms in labels, headlines, or notes, but in normal speech and writing, este should be there.

You would usually say:

Un produs este defect.

Here:

• un produs = a product
• este = is
• defect = defective

So the difference is:

• Produsul este defect. = The product is defective.
• Un produs este defect. = A product is defective.

Yes, in everyday speech Romanian often uses e instead of este.

So you may hear:

Produsul e defect.

This means exactly the same thing and sounds natural in conversation.

• este = slightly more formal or careful
• e = common in speech

The plural would be:

Produsele sunt defecte.

Changes:

• produsul → produsele = the products
• este → sunt = are
• defect → defecte = plural adjective

So:

Produsele sunt defecte. = The products are defective.

Yes, it is completely natural and correct.

It is a clear, neutral sentence you might use in customer service, complaints, quality control, or everyday conversation when talking about a faulty item.