WordNet (r) 3.0 (2006):

passive resistance
    n 1: peaceful resistance to a government by fasting or refusing
         to cooperate [syn: passive resistance, nonviolent
         resistance, nonviolence]

Moby Thesaurus II by Grady Ward, 1.0:

114 Moby Thesaurus words for "passive resistance":
   Quakerism, a wise passiveness, acquiescence, amenability,
   challenge, civil disobedience, combative reaction, complaint,
   compliance, contemplation, contemplative life, counteraction,
   defiance, demur, disobedience, dispute, dissent, dissentience,
   do-nothing policy, do-nothingism, do-nothingness, dormancy,
   fractiousness, frowardness, humbleness, humility, idleness,
   immobility, inaction, inactivity, indiscipline, indocility,
   indolence, inertia, inertness, infraction, infringement,
   insubordination, intractability, laissez-aller, laissez-faire,
   laissez-faireism, lawbreaking, lawlessness, meditation, meekness,
   naughtiness, negativism, neutralism, neutrality, neutralness,
   noncompliance, nonconformity, noncooperation, noninvolvement,
   nonobedience, nonparticipation, nonresistance, nonviolence,
   nonviolent resistance, obedience, objection, obstinacy, opposition,
   pacifism, paralysis, passive self-annihilation, passiveness,
   passivism, passivity, policy, procrastination, protest, quiescence,
   quietism, reaction, rebuff, recalcitrance, recalcitrancy,
   recalcitration, recusancy, refractoriness, reluctance,
   remonstrance, renitence, renitency, repellence, repellency,
   repulse, repulsion, resignation, resistance, revolt, stagnancy,
   stagnation, stand, standpattism, stasis, submission,
   submissiveness, transgression, uncomplainingness,
   uncooperativeness, unduteousness, undutifulness, unsubmissiveness,
   vegetation, violation, vita contemplativa, waiting game,
   watching and waiting, waywardness, willful disobedience,
   withstanding