adverse impact

/ˈædvərs ˈɪmpækt/ · ad·verse im·pact

noun

A negative or unfavorable effect, especially one that is unintended or unforeseen. The company's decision to lay off employees had an adverse impact on the local economy.
A consequence or outcome that is contrary to what is intended or desired. The new policy had an adverse impact on the environment, leading to increased pollution.

Synonyms

negative effect unfavorable consequence harmful impact detrimental effect disastrous outcome unintended consequence unforeseen effect negative consequence

Antonyms

positive effect favorable consequence beneficial impact helpful effect desirable outcome intended consequence

Did you know? The phrase 'adverse impact' is often used in environmental and social impact assessments to evaluate the potential effects of a project or policy on the environment and society.

Related terms

effect impact consequence outcome result resultant outcome aftermath

Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Aug 12, 2026