antagonism, assault, attack, battle, blocking, check, combat, confrontation, contention, contrariety, contrariness, contravention, contumacy, counteraction, defiance, disobedience, fight, hindrance, immunity, imperviousness, insubordination, insurgence, insurrection, interference, mutiny, noncompliance, nonconformance, obstinacy, obstruction, oppugnance, oppugnation, protest, rebellion, rebuff, recalcitrance, recusancy, refusal, reluctance, renitence, repugnance, repulsion, revolt, revolution, sedition, stand, strife, strike, struggle, unalterableness, unsusceptibility, unwillingness, unyieldingness, uprising, withstanding
conflict, contempt (disobedience to the court), contention (opposition), contest (dispute), contravention, defiance, deterrence, disadvantage, disapproval, fight (battle), impediment, impugnation, mutiny, negation, opposition, protest, reaction (opposition), rebellion, rebuff, refusal, reluctance, revolt, struggle
Burton's Legal Thesaurus. William C. Burton. 2006
n.Opposition; the use of force or arms to oppose or prevent something from happening.
The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. Amy Hackney Blackwell. 2008.