Definition of adverse:
in an opposing direction
Synonyms of adverse:
contrary, detrimental, harmful, unfavourable, negative, unfavorable, disadvantageous, hostile, inimical
Opposite/Antonyms of adverse:
favorable, helpful, good, fortunate, anodyne, advantageous, propitious, positive, harmless, medical
Sentence/Example of adverse:
The adverse effects of iron tablets are mainly feeling sick, abdominal pain, diarrhoea or constipation.