diametrically

/ˌdaɪəˈmɛtrɪkli/
adverb
  1. In a way that is completely opposite; used to emphasize that two things are as different as possible.
    • Their opinions on the matter are diametrically opposed.
    • The two approaches are diametrically different in their goals.
    • She and her sister have diametrically opposite tastes in music.
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