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ingenuous (adj.)

1590s, "noble in nature, high-minded; honorably straightforward," from Latin ingenuus "with the virtues of freeborn people, of noble character, frank, upright, candid," originally "native, freeborn," literally "born in (a place)," from in- "in" (from PIE root *en "in") + PIE *gen(e)-wo-, suffixed form of root gene- "to give birth, beget, produce" (see genus). Sense of "artless, innocent" is 1670s, via evolution from "honorably open, straightforward," to "innocently frank." Related: Ingenuously; ingenuousness.

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Definitions of ingenuous from WordNet

ingenuous (adj.)
characterized by an inability to mask your feelings; not devious;
an ingenuous admission of responsibility
Synonyms: artless
ingenuous (adj.)
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
Synonyms: innocent
From wordnet.princeton.edu