Source : Webster's Revised Unabridged Dictionary (1913)

Quietism \Qui"et*ism\, n. [Cf. F. qui['e]tisme.]
   1. Peace or tranquillity of mind; calmness; indifference;
      apathy; dispassion; indisturbance; inaction.

   2. (Eccl. Hist.) The system of the Quietists, who maintained
      that religion consists in the withdrawal of the mind from
      worldly interests and anxieties and its constant
      employment in the passive contemplation of God and his
      attributes.

Source : WordNet®

quietism
     n : a form of religious mysticism requiring withdrawal from all
         human effort and passive contemplation of God