Definition of regretfulness in US English:

regretfulness

noun

  • See regretful

    • ‘He was standing above me with genuine pity and regretfulness.’
    • ‘The hateful look in her blue eyes disappeared suddenly, replaced by one of respect and regretfulness, but only for an instant.’
    • ‘Heavy use of close-ups and a restlessly moving camera consistently evoke a sense of ‘now,’ which lends the regretfulness and nostalgia of the film's later sequences a great deal of power.’
    • ‘A pain of regretfulness hit me and I looked at Reese sympathetically.’
    • ‘I am truly contrite, penitent, repentant, remorseful and steeped in the tears of my regretfulness.’

Pronunciation

regretfulness

/rəˈɡretfəlnəs//rəˈɡrɛtfəlnəs/