Adverse

a.	1.
	1.	Acting against, or in a contrary direction; opposed; contrary; opposite; conflicting; as, adverse winds; an adverse party; a spirit adverse to distinctions of caste.
	2.	Opposite.
	3.	In hostile opposition to; unfavorable; unpropitious; contrary to one's wishes; unfortunate; calamitous; afflictive; hurtful; as, adverse fates, adverse circumstances, things adverse. Happy were it for us all if we bore prosperity as well and wisely as we endure an adverse fortune. - Southey. Adverse possession (Law) a possession of real property avowedly contrary to some claim of title in another person. - Abbott.
v. t.	1.	To oppose; to resist.

Adj.	1.	adverse - contrary to your interests or welfare; "adverse circumstances"; "made a place for themselves under the most untoward conditions" Synonyms: inauspicious, untoward, harmful
	2.	adverse - in an opposing direction; "adverse currents"; "a contrary wind" Synonyms: contrary

adversary, adversative, adversive, alien, anti, antipathetic, antithetic, antonymous, at cross-purposes, balancing, clashing, compensating, competitive, con, conflicting, confronting, contradictory, contradistinct, contrapositive, contrarious, contrasted, converse, counter, counterbalancing, counterpoised, countervailing, cross, dead against, deleterious, detrimental, difficult, disaccordant, disadvantageous, discordant, discrepant, dissentient, enemy, eyeball to eyeball, fractious, hard, harmful, hurtful, impeding, in opposition, inconsistent, inimical, injurious, inverse, miserable, negative, noncooperative, not easy, obstinate, obstructive, obverse, opponent, opposing, oppositional, oppositive, oppugnant, overthwart, perverse, prejudicial, recalcitrant, refractory, repugnant, reverse, rigorous, rival, sinister, squared off, stressful, troublesome, troublous, trying, uncooperative, unpropitious, unsatisfactory, untoward, wretched