How to Say "costly" in Spanish
The most common Spanish word for “costly” is “caro” — use 'caro' when referring to something that has a high price and is therefore expensive to buy..
caro
/káh-roh//ˈkaɾo/

Examples
Esta camisa es demasiado cara, no la puedo comprar.
This shirt is too expensive, I can't buy it.
Comprar un coche nuevo siempre resulta caro.
Buying a new car always turns out to be expensive.
Los billetes de avión son muy caros en verano.
Plane tickets are very expensive in the summer.
Agreement is Key
Like most Spanish adjectives, 'caro' changes its ending to match the noun's gender (masculine/feminine) and number (singular/plural): 'un libro caro' (m/s), 'una casa cara' (f/s), 'los viajes caros' (m/p), 'las entradas caras' (f/p).
Using 'Muy' vs. 'Mucho'
Mistake: “La falda cuesta mucho cara.”
Correction: La falda cuesta muy cara. ('Muy' means 'very' and describes adjectives; 'mucho' means 'a lot' and describes verbs or nouns.)
precioso
preh-SYOH-soh/pɾeˈθjoso/

Examples
El anillo tiene piedras preciosas, como diamantes.
The ring has precious stones, like diamonds.
El tiempo que pasamos juntos es precioso e irrecuperable.
The time we spend together is precious and irreplaceable.
Material vs. Aesthetic Value
In this sense, 'precioso' emphasizes the high material worth (like gold or gems) or the great personal value (like time or memories), moving beyond simple physical beauty.
Confusing 'Caro' and 'Precioso'
Related Translations
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