antagonism, antipathy, antithesis, backlash, bucking, challenge, clashing, collision, con, conflict, confrontation, confutation, contention, contradiction, contradistinction, contraindication, contrariety, contrast, contravention, contraversion, counteraction, counterposition, counterworking, crankiness, cross-purposes, crosscurrent, crossing, crotchetiness, denial, disagreement, discrepancy, dissent, friction, head wind, hostility, impugnation, impugnment, inconsistency, inimicalness, interference, kick, negation, nonconformity, opposing, oppositeness, opposition, opposure, oppugnance, oppugnancy, oppugnation, perverseness, perversity, polarity, reaction, rebutment, rebuttal, recalcitrance, recoil, refusal, rejection, renitency, repercussion, repugnance, resistance, revolt, showdown, standing against, swimming upstream, traversal, undercurrent