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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

With the GLS method, however, the researchers created Ti3C2Cl2, a version with only chlorine atoms arranged in a clean, ordered structure and no detectable impurities.

From Science Daily • Apr. 4, 2026

Novo Nordisk referenced the FDA's concerns in its lawsuit announcement on Monday, saying Hims & Hers' compounded drugs "may contain dangerous impurities or incorrect amounts of active ingredients, which can result in life-threatening immune responses".

From BBC • Feb. 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

"You were changed by the flower itself—I wasn't. Daoud's perfume contained impurities, so the effects were never going to be the same. Just think about it," she said as she rolled her sleeve back down.

From "City of the Plague God" by Sarwat Chadda