What does adversely mean?
"Adversely" is an adverb meaning in a way that produces harm or an unwelcome negative effect. It derives from the adjective "adverse," which traces back to the Latin "adversus," meaning turned against or opposed to — the same root that gives us "adversary" and "adversity." In modern usage, "adversely" appears most often in formal contexts such as news reports, scientific studies, legal documents, and official statements, typically paired with verbs like "affect" or "impact": rising prices may adversely affect consumers, or a policy change may adversely impact small businesses. Because it explicitly frames an outcome as harmful rather than merely different, the word carries a clearly negative connotation and is rarely used playfully or ironically. Its opposite is "favourably." Though uncommon in everyday speech, "adversely" is a precise and useful term for anyone writing about consequences, risks, or damage in a clear, professional register.
adverbIn a way that has a negative or harmful effect; so as to work against someone or something.
- In a way that causes harm or has a negative effect on someone or something.
"The new regulations adversely affected small businesses across the region."
"Rising interest rates adversely affected first-time homebuyers."
"The drought adversely impacted crop yields throughout the valley."
The word "adversely" carries the same Latin root as your worst enemy — "adversus," meaning turned against you — which is why it always signals that something is working against you.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of adversely
"Adversely" is formed from the adjective "adverse" plus the adverbial suffix "-ly." "Adverse" comes from the Latin "adversus," the past participle of "advertere" (to turn toward), used in the sense of turned against or opposing. The same Latin root produced "adversary" and "adversity," making them close cognates. The adverb entered English usage alongside its parent adjective, which was established in English by the late Middle English period.
Related word forms
How adversely is actually used
A formal word typical of reports, journalism, legal and medical writing; rare in casual conversation. It is almost always used with verbs of affecting or impacting rather than standing alone.
Easily confused with adversely
"Averse" means feeling strong dislike or opposition toward something, while "adversely" describes actually causing harm or a negative effect.