This is the 3345th most frequent Polish word.
używanych
"Used" or "second-hand."
Here, 'używanych' functions as an adjective describing the noun 'książek' (books), indicating their condition as being previously owned or used.
Kupiłem kilka używanych książek w antykwariacie.
I bought a few used books at the second-hand bookshop.
In this instance, 'używanych' modifies the noun 'samochodów' (cars), specifying that the cars in question are pre-owned or not new.
Sprzedaż używanych samochodów wzrosła w tym roku.
The sale of used cars increased this year.
Here, 'używanych' qualifies the noun 'ubrań' (clothes), highlighting their state of having been previously utilized, often emphasizing sustainability.