Restaurantul liniștit este mai scump, cel zgomotos este mai ieftin.

In Romanian, the definite article is enclitic (attached to the end of the noun). For masculine singular nouns ending in a consonant, the article is -ul. So:
• restaurant (a restaurant) + -ul → restaurantul (the restaurant).

The default adjective position in Romanian is after the noun. Therefore:
• restaurantul liniștit (the quiet restaurant).
An adjective before the noun is possible but usually adds emphasis or a poetic tone.

Romanian uses mai + adjective for comparatives (both “more …” and “less …”). For example:
• scump (expensive) → mai scump (more expensive)
• ieftin (cheap) → mai ieftin (cheaper)

To avoid repetition, Romanian replaces the second noun phrase with the demonstrative pronoun cel (“the one”) + adjective. Here:
• cel zgomotos = “the noisy one,” implicitly referring back to “restaurant.”

cel is a masculine singular demonstrative pronoun meaning “the one.” It agrees in gender and number:
• cel (m. sg.)
• cea (f. sg.)
• cei (m. pl.)
• cele (f. pl.)
In our sentence, cel zgomotos matches the masculine singular restaurant.

Adjectives must match the noun’s gender (masculine/feminine) and number (singular/plural). Examples for “quiet” and “noisy”:
• Masculine singular: liniștit, zgomotos
• Feminine singular: liniștită, zgomotoasă
• Masculine plural: liniștiți, zgomotoși
• Feminine plural: liniștite, zgomotoase

• ș = [ʃ], like “sh” in “shop.”
• ț = [ts], like “ts” in “cats.”
So:
• liniștit ≈ lee-NEESH-tit
• zgomotos ≈ zgo-MO-tos