There are several synonyms for the word "steriles." One common synonym is "sterilized," which indicates that something has been made free of bacteria or other microorganisms. Another synonym is "aseptic," which means clean or free of contaminants. "Sanitary" and "hygienic" are also synonyms that indicate cleanliness and freedom from germs. Additionally, "barren" and "infertile" can be used as synonyms for "steriles," as they both imply an inability to produce or sustain life. Other possible synonyms include "unproductive," "unfruitful," and "lifeless." Overall, there are many words that can be used in place of "steriles" to convey various aspects of cleanliness, barrenness, and lack of productivity.