naiveté

/N EY1 V EH0 T/
noun
  1. 1

    Lack of sophistication, experience, judgement or worldliness; artlessness; gullibility; credulity.

Source: https://en.wiktionary.org/wiki/na%C3%AFvet%C3%A9, https://en.wiktionary.org/wiki/naivet%C3%A9