Costoso/a, caro/a
It means "the opposite of expensive" Cheap in spanish is "barato"
Caro is from Portuguese, Spanish and the Italian 'caro' meaning 'dear' or 'beloved'.
It can either be: Es dimasiado caro. or Es muy caro.
it means: more expensive.
Translation: Caros
Es muy caro.
"Dear" and "expensive" are English equivalents of the Italian, Portuguese, and Spanish word caro. The word in question represents the masculine singular form of an adjective. The respective pronunciations will be "KA-ro" in Italian and Spanish and "KA-ru" in Portuguese.
I am wondering if you mean, "Quiero saber"? That means "I want to know."
The opposite of sociable in Spanish is introvertido.
Es demasiado caro/a (masculine/feminine, per gender of 'it') Vale demasiado - It costs too much
'Opposite' is 'Opuesto' in Spanish.