Definition of naiveness in English:

naiveness

(also naïveness)

noun

See naive

‘Their futures in dealing with personal relationships - romantic and otherwise - will suffer from unfamiliarity and naiveness.’
  • ‘I was a willing victim of the naiveness of youth.’
  • ‘Once again, these B-grade luxury goods sellers thrive on the naiveness of tourists.’
  • ‘The op-ed page seems always to be going on about the naïveness of the anti-globalization view.’