emphatic - definition and synonyms

adjective 

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/ɪmˈfætɪk/
  1. 1
    said or shown in a very strong clear way

    He refused my offer with an emphatic shake of the head.

    1. a.
      making your meaning very clear because you have very strong feelings about a situation or subject
      emphatic about:

      He was pretty emphatic about me leaving.

      emphatic that:

      The president was emphatic that there would be no negotiating with the terrorists.