unmercifulness

/ʌnˈmɜrsɪfəlnəs/
noun
  1. The quality of being cruel or having no pity; lack of mercy.
    • The novel explores the unmercifulness of nature in the frozen wilderness.
    • She could not understand the unmercifulness of her boss's decision to fire everyone.
    • The unmercifulness of the dictator shocked the world.
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