entscheidend

adjective
  1. Having the power or quality of deciding; conclusive or crucial. adjective
    The entscheidend factor in the decision was the cost.
    Her role was entscheidend in the success of the project.
  2. Marked by or having a significant impact or influence; critical. adjective
    The meeting was entscheidend for the future of the company.
    His speech was entscheidend in swaying the opinion of the audience.