fatalism
US /ˈfeɪ.t̬əl.ɪ.zəm/
UK /ˈfeɪ.t̬əl.ɪ.zəm/

1.
the belief that all events are predetermined and therefore inevitable
:
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His fatalism led him to accept his misfortunes without complaint.
•
The novel explores themes of free will versus fatalism.