What does uncontaminated mean?
Uncontaminated means free from contamination or corruption of any kind. In literal contexts, it describes water, food, soil, air, equipment, or biological samples that have not been spoiled, polluted, exposed to harmful organisms, or otherwise made unsafe or impure. The word is especially useful in scientific, medical, environmental, and industrial settings, where the absence of contamination can be an important condition for testing or use. Figuratively, it can refer to a person, idea, institution, or source of information that remains unaffected by corruption, bias, interference, or selfish influence. Its strong negative prefix makes it emphatic and formal, often suggesting that purity has been deliberately preserved or verified. Although less conversational than clean, pure, or untouched, uncontaminated clearly communicates that something is not merely generally good but specifically free from contamination.
adjectiveNot contaminated; free from impurity, harmful substances, microorganisms, or corrupting influence.
- Free from contamination, impurity, harmful substances, microorganisms, or other corrupting influences.
"The laboratory confirmed that the water sample remained uncontaminated throughout the testing period."
"Researchers collected uncontaminated soil from the edge of the lake."
"Her commitment to the project remained uncontaminated by personal ambition."
Sometimes the simplest way to describe something is to say what it is not: uncontaminated means pure, clean, and free from corrupting influence.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does uncontaminated come from?
The base verb contaminate was borrowed into English from Latin contaminare, meaning “to soil, defile, or corrupt.” The adjective uncontaminated was formed by adding the English negative prefix un- to this base. Together, the prefix and base express the condition of being free from contamination, whether material or figurative.
How uncontaminated is actually used
The word is more formal than ordinary alternatives such as clean or pure. It is especially common in technical, scientific, environmental, and safety contexts, while its figurative use can suggest moral or intellectual purity.