Mobilierul este voluminos.

Because Romanian often puts the definite article at the end of the noun instead of using a separate word like English the.

• mobilier = furniture
• mobilierul = the furniture

So Mobilierul este voluminos literally means The furniture is bulky/voluminous.

Mobilier is a noun, and here it is singular.

Even though English furniture refers to a collection of items, it is also grammatically singular, and Romanian works similarly here. So you say:

• Mobilierul este... = The furniture is...

not a plural verb.

Este is the 3rd person singular form of the verb a fi (to be).

So:

• eu sunt = I am
• tu ești = you are
• el/ea este = he/she/it is

Since mobilierul is singular, Romanian uses este:

• Mobilierul este voluminos. = The furniture is bulky.

Because voluminos agrees with the noun mobilierul.

A useful point in Romanian is that neuter nouns behave like:

• masculine in the singular
• feminine in the plural

Mobilier is a neuter noun, so in the singular it takes the masculine singular adjective form:

• mobilier voluminos = bulky furniture

If it were a feminine singular noun, you would expect something like voluminoasă instead.

It is neuter.

That means:

• in the singular, it behaves like a masculine noun
• in the plural, it behaves like a feminine noun

That is why you get:

• mobilierul este voluminos (singular, masculine-style agreement)

This is very common in Romanian and often surprises English speakers.

A simple approximate pronunciation is:

mo-bee-lee-E-rul ES-te vo-loo-mee-NOS

A few helpful notes:

• -ul in mobilierul is the attached definite article
• este is usually pronounced clearly as ES-te
• stress in voluminos falls on the last syllable: -nos

You do not need perfect pronunciation right away, but it helps to notice that Romanian spelling is usually quite phonetic.

The normal, neutral order is:

• Mobilierul este voluminos.

Romanian does allow word order changes more easily than English, but changing the order usually adds emphasis or sounds literary, marked, or unnatural in everyday speech.

So for a learner, the safest version is:

• Mobilierul este voluminos.

Romanian often drops subject pronouns because the verb ending already shows the person:

• Sunt obosit. = I am tired.

But here the subject is not a pronoun; it is the noun mobilierul. If you remove it, you get:

• Este voluminos. = It is bulky.

That can work only if the context already makes clear what it refers to. Otherwise, keeping mobilierul is more natural and clear.

It is related, but in everyday use it often corresponds more naturally to bulky, large, or taking up a lot of space.

So in this sentence, a natural English idea is:

• The furniture is bulky.

Even if the meaning shown to the learner uses voluminous, in normal context English speakers may prefer bulky.

Yes. A very common word is mobilă.

Roughly:

• mobilier can sound a bit more formal, general, or collective
• mobilă is very common in everyday speech

For example:

• Mobila este veche. = The furniture is old.
• Mobilierul este modern. = The furniture is modern.

Both are useful, but mobilier is perfectly correct in your sentence.

In many contexts, mobilier is treated as a collective noun, much like English furniture, so the singular is the most common form when talking about furniture in general.

In practice, learners should first become comfortable with the singular use:

• mobilier
• mobilierul

If you want to talk about separate items, Romanian often uses words like:

• piese de mobilier = pieces of furniture

That is often more natural than trying to think of a regular everyday plural equivalent of English furnitures, which English itself normally does not use either.