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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

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

In quantum many-body physics, scientists have long debated how impurities behave when surrounded by large numbers of other particles.

From Science Daily • Feb. 8, 2026

Previous research has also shown that impurities weaken the structure of ice crystals, making them less stable than pure ice.

From Science Daily • Jan. 23, 2026

Jing is good leftover stuff when you take impurities out of something like gold, or rice, or salt.

From "The Joy Luck Club" by Amy Tan