The Collaborative International Dictionary of English v.0.48:

Renitence \Re*ni"tence\ (r?-n?"tens), Renitency \Re*ni"ten*cy\
   (-te-s?), n. [Cf. F. r['e]nitence.]
   The state or quality of being renitent; resistance;
   reluctance. --Sterne.
   [1913 Webster]

         We find a renitency in ourselves to ascribe life and
         irritability to the cold and motionless fibers of
         plants.                                  --E. Darwin.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

102 Moby Thesaurus words for "renitency":
   antagonism, antipathy, averseness, aversion, backlash,
   backwardness, challenge, clashing, collision, combative reaction,
   complaint, conflict, confutation, contradiction, contraposition,
   contrariety, counteraction, counterposition, counterworking,
   crankiness, crotchetiness, cursoriness, defiance, demur,
   disagreement, disinclination, disobedience, dispute, disrelish,
   dissent, dissentience, distaste, firmness, foot-dragging,
   fractiousness, friction, grudging consent, grudgingness,
   indisposedness, indisposition, indocility, interference,
   intractableness, kick, lack of enthusiasm, lack of zeal,
   mutinousness, negativism, nolition, nonconformity, noncooperation,
   objection, obstinacy, opposition, opposure, oppugnance, oppugnancy,
   passive resistance, perfunctoriness, perverseness, protest,
   reaction, rebuff, recalcitrance, recalcitrancy, recalcitration,
   recoil, refractoriness, refusal, reluctance, remonstrance,
   renitence, repellence, repellency, repercussion, repugnance,
   repulse, repulsion, resistance, revolt, rigidity, rigidness, rigor,
   slowness, stand, starchiness, stiffness, stubbornness, sulk,
   sulkiness, sulks, sullenness, swimming upstream, tautness,
   tenseness, tension, tensity, tightness, uncooperativeness,
   unenthusiasm, unwillingness, withstanding