unfavorable
unfavourable
adversary
adversative
adversive
afflictive
alien
antagonistic
anti
antipathetic
antithetic
antonymous
at cross-purposes
averse
balancing
calamitous
clashing
compensating
competitive
con
conflicting
confronting
contradictory
contradistinct
contrapositive
contrarious
contrary
contrasted
converse
counter
counteractive
counterbalancing
counterpoised
countervailing
cross
dead against
deleterious
detrimental
difficult
disaccordant
disadvantageous
discordant
discrepant
dissentient
enemy
eyeball to eyeball
fractious
hard
harmful
hostile
adversity
versus
beneficial
disastrous
disturb
environmental
negative
physiological
Perse
biodiverse
burse
coerce
curse
disburse
disperse
diverse
emerse
hearse
immerse
intersperse
inverse
merce
nurse
obverse
pearse
perce
pers
perse
perverse
purse
rehearse
reimburse
reverse
submerse
terse
transverse
traverse
vers
verse
worse