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impurities

NOUN

contaminant

Synonyms

STRONGEST

contamination grime pollutant scum

STRONG

adulteration corruption defilement dirt filth pestilence poisoning pollution stain taint uncleanness

WEAK

foreign matter

Antonyms

STRONGEST

cleanliness

STRONG

pureness purification purity sterility

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The manufacturing process can also introduce impurities — like bacteria or heavy metals — into peptide drugs.

From Salon • Apr. 4, 2026

The surface atoms are arranged in a uniform and highly ordered way, and unwanted impurities are greatly reduced.

From Science Daily • Apr. 4, 2026

These impurities make the chemical composition unpredictable and reduce performance, which prevents the material from meeting the strict standards required for structural automotive alloys.

From Science Daily • Mar. 10, 2026

Ice masters look at the PH levels of the water and purify it to remove minerals and impurities.

From BBC • Feb. 10, 2026

Worst of all, he will have no resistance to germs and infection; he will be very susceptible to pneumonia or even the mildest impurities in his food and water.

From "Z for Zachariah" by Robert C. O’Brien