Definition of blackheartedness in English:

blackheartedness

noun

literary

See black-hearted

‘It might be that each thief is a black-hearted scoundrel; but it is equally possible that black-heartedness is only a feature of one or two.’
  • ‘Animals can never hope to plumb the black-heartedness of men.’
  • ‘He was convinced of the black-heartedness of those who stood in his way.’
  • ‘'Tis the first time my cousin's blackheartedness has done me some good.’
  • ‘The power-hungry authorities have displayed brutality and blackheartedness.’