Questo rumore è orribile.

Because questo has to agree with rumore, and rumore is a masculine singular noun.

The main forms are:

• questo = masculine singular
• questa = feminine singular
• questi = masculine plural
• queste = feminine plural

So:

• questo rumore = this noise
• questa musica = this music

Because questo already works as a demonstrative adjective meaning this. In Italian, demonstratives normally replace the article, rather than combining with it.

So you say:

• questo rumore = this noise

not:

• il questo rumore

That would sound wrong in standard Italian.

The accent is important because è is the verb is from essere.

Without the accent, e means and.

So:

• è = is
• e = and

This is one of the most important spelling differences in Italian.

Yes, Italian adjectives agree with the noun in gender and number. But orribile belongs to a group of adjectives that have:

• one form in the singular: orribile
• one form in the plural: orribili

So you get:

• rumore orribile = horrible noise
• musica orribile = horrible music
• rumori orribili = horrible noises
• canzoni orribili = horrible songs

Notice that masculine singular and feminine singular are both orribile.

It is a very common pattern:

• Questo rumore = subject
• è = verb
• orribile = predicate adjective

So the structure is:

subject + essere + adjective

This is exactly the kind of structure used in sentences like:

• La stanza è piccola = The room is small
• Il film è noioso = The film is boring
• Questo rumore è orribile = This noise is horrible

Yes, but that means something slightly different.

• Questo rumore è orribile = This noise is horrible
• un rumore orribile = a horrible noise

In Questo rumore è orribile, orribile comes after the verb è because it describes the subject through the verb to be.

In un rumore orribile, orribile directly modifies the noun rumore.

So both are correct, but they are different sentence structures.

A simple English-friendly guide is:

KWEH-sto roo-MOH-re eh or-REE-bee-le

A few useful pronunciation notes:

• qu in questo sounds like kw
• è sounds like eh
• the r in Italian is usually more tapped or rolled than in English
• every vowel is pronounced clearly

So try to avoid reducing the vowels the way English often does.

Not exactly.

• rumore usually suggests noise, often unwanted or unpleasant
• suono is more neutral and means sound

So Questo rumore è orribile sounds natural if you are complaining about an annoying sound.

If you said Questo suono è orribile, that could also work, but it sounds a bit more neutral or technical depending on context.

Yes, if the context is clear, but the meaning changes slightly.

Compare:

• Questo rumore è orribile = This noise is horrible
• Il rumore è orribile = The noise is horrible
• È orribile = It is horrible / It’s horrible

Questo points to a specific noise, often one happening right now or one close to the speaker’s attention.

Questo rumore è orribile is the most neutral and natural word order.

Italian can change word order for emphasis, for example:

• È orribile, questo rumore = This noise is horrible / This noise is just horrible

But for a learner, the standard order is the best one to use:

subject + verb + adjective