Terasa este liniștită.

In Romanian, the definite article is usually attached to the end of the noun.

• terasă = terrace / a terrace
• terasa = the terrace

So in Terasa este liniștită, terasa already includes the meaning the terrace.

This is a very common Romanian pattern:

• casă = house
• casa = the house
• masă = table
• masa = the table

The base form is terasă.

Here is the breakdown:

• terasă = a terrace / terrace
• terasa = the terrace

The ending -a here is the feminine singular definite article attached to the noun.

So:

• O terasă este liniștită. = A terrace is quiet.
• Terasa este liniștită. = The terrace is quiet.

Este means is and comes from the verb a fi = to be.

So the sentence structure is very straightforward:

• Terasa = the terrace
• este = is
• liniștită = quiet / शांत / calm (in English: quiet, peaceful)

Romanian normally keeps the verb to be in this kind of sentence, unlike some languages where it can be omitted.

You may also hear e instead of este in everyday speech:

• Terasa este liniștită.
• Terasa e liniștită.

Both are correct. Este is a little fuller and slightly more formal/neutral.

Because Romanian adjectives agree with the noun in gender and number.

terasă is a feminine singular noun, so the adjective must also be feminine singular:

• masculine singular: liniștit
• feminine singular: liniștită
• masculine plural: liniștiți
• feminine plural: liniștite

So:

• un balcon liniștit = a quiet balcony
• o terasă liniștită = a quiet terrace

This agreement is a key feature of Romanian grammar.

It can mean more than just quiet.

liniștit / liniștită often covers ideas like:

• quiet
• calm
• peaceful
• tranquil

For a place like a terrace, it usually suggests that it is peaceful, not noisy, relaxing, or calm.

So Terasa este liniștită could imply:

• the terrace is quiet
• the terrace is peaceful
• the terrace has a calm atmosphere

The exact best translation depends on context.

These two Romanian letters are very important:

• ș sounds like English sh in ship
• ă is a short central vowel, something like the a in sofa or a soft uh

So:

• terasă is roughly teh-RA-suh
• liniștită contains ș = sh, and the final ă is that soft uh sound

Also, ț would sound like ts, but it does not appear in this sentence.

In Romanian, adjectives often come after the noun.

So:

• terasa liniștită = the quiet terrace

This is very normal Romanian word order.

English usually puts adjectives before the noun:

• the quiet terrace

Romanian can sometimes place adjectives before the noun for style, emphasis, or certain fixed expressions, but the normal position here is after the noun.

Yes, Romanian word order is somewhat flexible, though the most neutral version here is:

• Terasa este liniștită.

You could also hear:

• Este liniștită terasa.

That can sound more marked or emphatic, as if focusing on the terrace or on the quality quiet.

For a learner, the safest and most natural default is:

• Subject + este + adjective
• Terasa este liniștită.

Not if you want a complete sentence meaning The terrace is quiet.

• Terasa este liniștită. = complete sentence
• terasa liniștită = the quiet terrace (a noun phrase, not a full sentence)

So without este, it no longer means is quiet. It just becomes a description of the noun.

Compare:

• Terasa este liniștită. = The terrace is quiet.
• Terasa liniștită este frumoasă. = The quiet terrace is beautiful.

Yes, terasă is a feminine noun.

That is why you get:

• o terasă = a terrace
• terasa = the terrace
• liniștită = feminine adjective form

Since it is feminine singular, other words connected to it will often show feminine singular agreement too.

Yes, it is completely natural.

It sounds like a simple descriptive sentence someone might say about a place, for example:

• when comparing indoor and outdoor seating
• when describing a café
• when talking about a hotel or home
• when mentioning that a place is peaceful and not noisy

In conversation, many speakers would also say:

• Terasa e liniștită.

That is just a more casual spoken version of the same sentence.