Questo prezzo è ridicolo.

Because questo has to agree with prezzo, and prezzo is masculine singular.

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

So:

• questo prezzo = this price
• questa casa = this house

In Italian, a demonstrative like questo usually takes the place of the article.

So you say:

• questo prezzo = this price

not normally:

• questo il prezzo

The same thing happens in English: you say this price, not this the price.

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

• è = is
• e = and

So:

• Questo prezzo è ridicolo = This price is ridiculous
• pane e formaggio = bread and cheese

The accent helps you tell those two words apart in writing.

Because ridicolo is agreeing with prezzo, which is masculine singular.

In Italian, adjectives usually agree in gender and number with the noun they describe.

Here:

• prezzo = masculine singular
• so the adjective is ridicolo

Compare:

• un prezzo ridicolo = a ridiculous price
• una situazione ridicola = a ridiculous situation

Here it is an adjective.

In Questo prezzo è ridicolo, the structure is:

• Questo prezzo = subject
• è = verb
• ridicolo = adjective describing the subject

So it works like English This price is ridiculous.

You do not need an article before ridicolo here.

Because in Italian, adjectives often come after the noun.

So:

• prezzo ridicolo is the normal order

Italian can sometimes put adjectives before the noun, but that often changes the tone or emphasis. For a straightforward statement, prezzo ridicolo is the natural choice.

It can relate to both ideas, but the exact meaning depends on context.

With price, ridicolo means something like:

• ridiculous
• absurd
• outrageous

So in this sentence it does not mean funny in a positive sense. It means the price is absurdly high, low, or unreasonable.

A helpful approximation is:

KWEH-sto PRET-tso eh ree-DEE-ko-lo

A few details:

• qu in questo sounds like kw
• zz in prezzo sounds like tts or ts
• è is pronounced like eh
• stress falls roughly on:
  • QUEsto
  • PRÈTzo
  • ridÌcolo

A more phonetic version is:

[ˈkwɛsto ˈprɛttso ɛ riˈdikolo]

Yes, absolutely.

• Questo prezzo è ridicolo = This price is ridiculous
• Il prezzo è ridicolo = The price is ridiculous

The difference is the same as in English:

• questo points to a specific price, often one you are looking at or talking about right now
• il is more general or just refers to the price already known in context

The plural would be:

Questi prezzi sono ridicoli.

Changes:

• questo → questi
• prezzo → prezzi
• è → sono
• ridicolo → ridicoli

So everything that needs to agree changes accordingly.

Yes, that is a very natural word-for-word match:

• Questo = this
• prezzo = price
• è = is
• ridicolo = ridiculous

So this sentence is a nice example where Italian and English line up very closely.

The normal, neutral order is:

Questo prezzo è ridicolo.

Italian does allow word-order changes for emphasis, but this is the standard version and the one learners should use first.

So for everyday use, stick with:

• subject + verb + adjective

here:

• Questo prezzo
  • è
    • ridicolo