This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Lacking in cunning, guile, or worldliness; artless.

adj. Openly straightforward or frank; candid. See Synonyms at naive.

adj. Obsolete Ingenious.

adj. Naive and trusting.

adj. Demonstrating childlike simplicity.

adj. Unsophisticated; simple.

adj. Unable to mask one's feelings.

adj. Straightforward, candid, open, and frank.

adj. Of honorable extraction; freeborn; noble.

adj. Noble; generous; magnanimous; honorable; upright; high-minded.

adj. Free from reserve, disguise, equivocation, or dissimulation; open; frank

adj. Ingenious.

Freeborn; of honorable extraction.

Generous; noble: as, an ingenuous ardor or zeal.

Free from restraint or reserve; frank; open; candid: used of persons or things: as, an ingenuous mind; an ingenuous confession.

Same as ingenious.

Synonyms Frank, Naïve, etc. (see candid); unreserved, artless, guileless, straightforward, truthful.

adj. characterized by an inability to mask your feelings; not devious

adj. lacking in sophistication or worldliness

"Criminals on trains often adopted what the researchers described as ingenuous tactics in their activities."

heart-to-heart    open    undistorted    candid    naive    naïf   

disingenuous   

open    frank    sincere    artless    noble    candid    unreserved    plain    fair    generous   

disingenuous    strenuous   

artless    candid    frank    guileless    naive    childlike    amiable    boyish    manly    womanly