Definition of fallaciousness in US English:

fallaciousness

noun

  • See fallacious

    • ‘I suppose it would be pointless to explicate the obvious fallaciousness of that "logic"; those who don't already see it probably don't want to.’
    • ‘But to submit moral and even political issues to a vote, at least to the logically minded, is to celebrate fallaciousness. Democratic rule is inherently irrational, built entirely on fallacy.’

Pronunciation

fallaciousness

/fəˈlāSHəsnəs//fəˈleɪʃəsnəs/