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Adverb: decisively  di'sI-siv-lee
  1. With firmness of purpose
    "'I will come along,' she said decisively";
    - resolutely, decidedly
  2. With finality; conclusively
    "the voted settled the argument decisively"
  3. In an indisputable degree
    "the Fisher Act of 1918 decisively raised their status and pay"

Antonym: indecisively