Definition of feistiness in US English:

feistiness

noun

informal
  • See feisty

    • ‘He objects to feistiness in anybody but himself.’
    • ‘‘I just find your feistiness,’ he searched for the right word, 'amusing.’’
    • ‘His enthusiasm and feistiness have tempered a lineup that was beginning to take itself too seriously.’
    • ‘They bring a youthful feistiness to the roles, but there isn't the bitterness or sophistication to make Shakespeare's rapier swift dialogue sting.’
    • ‘She is composed almost entirely of feistiness.’

Pronunciation

feistiness

/ˈfīstēnis/