adversative
adverse
alien
antagonist
antagonistic
anti
antipathetic
antithetic
archenemy
assailant
bitter enemy
clashing
combatant
competitive
competitor
con
conflicting
contradictory
contrary
counter
cross
devil
disaccordant
dissentient
enemy
foe
foeman
fractious
hostile
inimical
negative
noncooperative
obstinate
open enemy
opponent
opposed
opposing
opposing party
opposite
opposite camp
oppositional
oppositive
individual
mortal
person
somebody
someone
soul
Luddite
antichrist
dueler
duelist
dueller
duellist
opposition
withstander
adversarially
admirer
advocate
ally
champion
colleague
comrade
critic
defender
fighter
follower
obstacle
partner
predator
rival
villain
warrior