Real Dictionary

quietism in American English
a mysticism based on spiritual passivity; specif., a mysticism so minimizing or so completely rejecting human volition and effort as, often, to produce indifference to one's lot in an afterlife and to engender a sense of being incapable of any personal me
noun: a form of religious mysticism taught by Molinos, a Spanish priest, in the latter part of the 17th century, requiring extinction of the will, withdrawal from worldly interests, and passive meditation on God and divine things; Molinism

quietism in British English
noun: a form of religious mysticism originating in Spain in the late 17th century, requiring withdrawal of the spirit from all human effort and complete passivity to God's will