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adverse (adj.)

late 14c., "contrary, opposing," from Old French advers, earlier avers (13c., Modern French adverse) "antagonistic, unfriendly, contrary, foreign" (as in gent avers "infidel race"), from Latin adversus "turned against, turned toward, fronting, facing," figuratively "hostile, adverse, unfavorable," past participle of advertere "to turn toward," from ad "to" (see ad-) + vertere "to turn, turn back; be turned; convert, transform, translate; be changed" (from PIE root *wer- (2) "to turn, bend"). For distinction of use, see averse. Related: Adversely.

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Definitions of adverse from WordNet

adverse (adj.)
contrary to your interests or welfare;
adverse circumstances
Synonyms: inauspicious / untoward
adverse (adj.)
in an opposing direction;
adverse currents
Synonyms: contrary
From wordnet.princeton.edu