ingenuous

/ɪnˈdʒɛnjuəs/
adjective
  1. Honest, innocent, and trusting, often in a way that seems naive or unsuspecting.
    • The child's ingenuous question about why adults work so hard made everyone smile.
    • Her ingenuous belief that everyone tells the truth sometimes gets her into trouble.
    • He gave an ingenuous apology, admitting his mistake without any excuses.
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