contraposition (?.)

• 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