NOUN – devotional contemplation and abandonment of the will as a form of religious mysticism.

Quietism is the pejorative name given to a set of Christian beliefs that rose in popularity in France, Italy, and Spain during the late 1670s and 1680s

Quietism Definition & Meaning – Merriam-Webster

For a better understanding watch – Quietism: Why we all need more of it in our lives | A-Z of ISMs Episode 17 – BBC Ideas – Bing video

I have encountered this word from “BAD IDEAS ABOUT WRITING” by Cherlyn E. Ball & Drew M. Loewe ( page 10)

Quote from the reading – ”
If I am making a speech trying to persuade people to become more active in politics, I might argue from precedent or argue that the consequences of political activism are good or point out inconsistencies in the argument for political quietism, and so on”.

In this particular quote, quietism refers to political quietism – the withdrawal from political affairs.