naif

Adjective
  1. Marked by or showing unaffected simplicity and lack of guile or worldly experience (synset 302279294)
    "a teenager's naive ignorance of life"; "the naive assumption that things can only get better"; "this naive simple creature with wide friendly eyes so eager to believe appearances"
Noun
  1. A naive or inexperienced person (synset 110363852)

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