oppositional (?.)

• adversary
• adversative
• adverse
• adversive
• alien
• antagonistic
• anti
• antipathetic
• antithetic
• antonymous
• at cross-purposes
• balancing
• breakaway
• clashing
• compensating
• competitive
• con
• conflicting
• confronting
• contradicting
• contradictory
• contradistinct
• contrapositive
• contrarious
• contrary
• contrasted
• converse
• counter
• counteractant
• counteracting
• counteractive
• counterbalancing
• counterpoised
• countervailing
• counterworking
• cranky
• cross
• crotchety
• dead against
• disaccordant
• discordant
• discrepant
• dissentient
• dissident
• enemy
• eyeball to eyeball
• fractious
• hostile
• inconsistent
• inimical
• inverse
• negative
• nonconformist
• noncooperative
• obstinate
• obverse
• opponent
• opposed
• opposing
• opposite
• oppositive
• oppugnant
• overthwart
• perverse
• reactionary
• recalcitrant
• refractory
• renitent
• repugnant
• resistant
• reverse
• revolutionary
• rival
• squared off
• uncooperative
• unfavorable
• unfriendly
• unpropitious