Select the most appropriate ANTONYM of the given word.

Impure

Sterile

The most appropriate antonym of the word impure is sterile.

• Impure means "not pure; mixed with something else."
• Sterile means "free from living microorganisms; germ-free."

The other words do not have the same meaning as impure, so they are not its antonyms.

• Contaminated means "made impure by the introduction of something harmful or dirty."
• Segregated means "kept separate from others, especially on the basis of race, class, or gender."
• Concentrated means "having a high proportion of a particular substance or element."