1680s, from Italian quietismo, literally "passiveness," from quieto "calm, at rest," from Latin quietus "free; calm, resting" (from PIE root *kweie- "to rest, be quiet"). Originally in reference to the mysticism of Miguel Molinos (1640-1697), Spanish priest in Rome, whose "Guida spirituale" was published 1675 and condemned by the Inquisition in 1685. Related: Quietist.
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