1. (a.) Not agreeing with established opinion; dissenting; discordant; as, dissident political or religious beliefs\.

2. (n.) One who disagrees or dissents; one who separates from the established religion.

alienated antagonistic antiestablishment antipathetic apostate at cross-purposes at loggerheads at odds at odds with at variance at variance with at war bitter-ender brawler breakaway clashing colliding conflicting contentious contradicting contradictory contrary counter-culture counteractant counteracting counteractive countervailing counterworking cranky cross crotchety defendant demurrer deviant diehard differing disaccordant disagreeable disagreeing discordant discrepant disharmonious disproportionate disputant dissenter dissentient dissenting dissonant divergent grating heretic heterodox hostile immiscible in opposition inaccordant incompatible inharmonious inimical intransigent irreconcilable jangling jarring last-ditcher litigant misbeliever naysayer negative negativist nonconformable nonconforming nonconformist noncooperator nonobservant objector obstructionist obstructive opinionist opposer opposing opposition voice oppositional oppositionist oppugnant out of accord out of whack perverse plaintiff protestant protester protestor quarreler reactionary rebel recalcitrant recusant refractory renitent repugnant resistant resister revolutionary schismatic scrapper sectarian sectary separatist unadaptable unadjustable uncompliant unconforming uncongenial underground unharmonious unorthodox unsubmissive variant wrangler