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Adjective: ingenuous  in'jen-yoo-us
  1. Characterized by an inability to mask your feelings; not devious
    "an ingenuous admission of responsibility";
    - artless
     
  2. Lacking in sophistication or worldliness
    "his ingenuous explanation that he would not have burned the church if he had not thought the bishop was in it";
    - innocent

See also: candid, heart-to-heart, naif, naïf, naive, naïve, open, sincere, undistorted, wet behind the ears