What does unimpaired mean?
Unimpaired describes something that has not been damaged, injured, or weakened. A person whose hearing remains unimpaired, for example, still has full auditory function; similarly, an object can be described as unimpaired when age or handling has not diminished it. The word is more formal than undamaged and commonly appears in medical, legal, technical, and descriptive contexts. In traffic and drink-driving law, it may have a jurisdiction-specific meaning, referring to whether alcohol or drugs have affected a person to the degree required by local rules, so legal consequences cannot be inferred from the word alone. Unimpaired can also suggest that a person retains their normal faculties and, by extension, soundness of judgment. Its precision makes it useful in formal writing, although it may sound overly formal in casual conversation.
adjectiveNot damaged, injured, or otherwise weakened in condition or function; free from impairment.
- Not damaged, injured, diminished, or otherwise affected in condition or function.
- In legal and regulatory contexts, not affected by alcohol or drugs to the degree required by the applicable jurisdictional standard.
"Despite years of exposure to harsh weather, the building's original timber remained unimpaired."
"The witness's hearing remained unimpaired despite many years of exposure to loud machinery."
"The defence argued that the driver was unimpaired because the evidence did not establish impairment."
Unimpaired is a linguistic neat trick: it means “not impaired,” using a negative prefix to undo a word that itself means “made worse.”
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does unimpaired come from?
English formed unimpaired by adding the negative prefix un- to impaired, expressing the sense “not impaired.” Impaired derives from impair, which came through Anglo-French from Latin impedire, meaning “to hinder or obstruct.” Related English words such as impair, impairment, impede, and impediment reflect this same Latin source.
How unimpaired is actually used
The adjective is formal and commonly used in medical, legal, technical, and descriptive writing. Legal uses concerning driving vary by jurisdiction; unimpaired does not necessarily mean completely free from alcohol or drugs.
Easily confused with unimpaired
Unimpaired means undamaged or unaffected, whereas unprepared means not ready or adequately equipped.