Obstructionist
[n] someone who systematically obstructs some action that others want to take
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Related Terms
bitter-ender, brawler, defendant, diehard, disputant, dissentient, dissident, filibuster, filibusterer, frustrater, hinderer, impeder, intransigent, irreconcilable, last-ditcher, litigant, marplot, naysayer, negativist, noncooperator, objector, obstructer