Zweifel

noun
  1. A feeling of uncertainty or lack of conviction. noun
    He expressed his Zweifel about the success of the project.
    Her constant Zweifel made it difficult for her to make decisions.
  2. A state of being unsure or skeptical about something. noun
    There was a lot of Zweifel among the team members regarding the new strategy.
    Despite his Zweifel, he decided to give it a try.