diametrical

/ˌdaɪəˈmɛtrɪkəl/
adjective
  1. Completely opposite; directly opposed in nature, opinion, or direction.
    • Her approach to problem-solving is diametrical to her partner's cautious style.
    • The brothers have diametrical personalities—one is outgoing, the other shy.
    • The two politicians held diametrical views on healthcare reform.
  2. Relating to a diameter; passing through the center of a circle or sphere.
    • Engineers measured the diametrical distance across the pipe.
    • A diametrical plane cuts the sphere exactly through its center.
    • The diametrical line divides the circle into two equal halves.