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What does adverse mean?

Looking for the meaning or definition of the word adverse? Here's what it means.

Adjective
  1. Unfavorable; antagonistic in purpose or effect; hostile; actively opposing one's interests or wishes; contrary to one's welfare; acting against; working in an opposing direction.
  2. Opposed; contrary; opposing one's interests or desire.
  3. (not comparable) Opposite; confronting.
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Examples
If major adverse reactions occur, the regimen, or the offending drug, if identified, must be stopped.
If you don't have an adverse reaction, the allergen dose is increased each time you receive a shot.
It makes constructive suggestions as to how the laws may be amended to ameliorate some of the adverse impacts on young people.
The delays in according immigration status can have significant adverse effects upon a successful asylum seeker.
Twenty-five patients experienced adverse drug reactions, but only 12 of them needed drug modifications.
Caffeine and alcohol give a temporary charge but have adverse after-effects.

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