- unfavorable or antagonistic in purpose or effect: adverse criticism.
- opposing one's interests or desire: adverse circumstances.
- being or acting in a contrary direction; opposed or opposing: adverse winds.
- opposite; confronting: the adverse page.
Origin of adverse
SynonymsSee more synonyms on Thesaurus.com
Examples from the Web for adverse
“Any time you put a foreign substance into anybody you have the potential for an adverse event,” Geisbert reminds.
Human trials of the Ebola vaccine have been temporarily shut down due to adverse side effects.
However, just because a vaccine is replication-defective does not mean that you won't have an adverse event.
For the individual patient, there is the potential for side effects or adverse reactions.Without Education, Antibiotic Resistance Will Be Our Greatest Health Crisis
December 19, 2014
Reeve passed away after experiencing an adverse reaction to an antibiotic on Oct. 10, 2004.Robin Williams and Christopher Reeve's Epic Friendship and the Greatest Williams Story Ever Told
August 12, 2014
The experience of civilized nations has hitherto been adverse to Socialism.The Republic
Nor was it a small inducement to him to think that the side he adopted was adverse to Kate.Luttrell Of Arran
Charles James Lever
The adverse weather held us in front and the disease pressed on our rear.The Shadow-Line
"Some adverse influence is at work," said Funkelstein, with some vexation.David Elginbrod
It is not wonderful that property began in adverse possession.Ancient Law
Sir Henry James Sumner Maine
- antagonistic or inimical; hostileadverse criticism
- unfavourable to one's interestsadverse circumstances
- contrary or opposite in direction or positionadverse winds
- (of leaves, flowers, etc) facing the main stemCompare averse (def. 2)
Word Origin and History for adverse
late 14c., "contrary, opposing," from Old French avers (13c., Modern French adverse) "antagonistic, unfriendly, contrary, foreign" (e.g. gent avers "infidel race"), from Latin adversus "turned against, turned toward, fronting, facing," figuratively "hostile, adverse, unfavorable," past participle of advertere, from ad- "to" (see ad-) + vertere "to turn" (see versus). Related: Adversely.