Of honorable extraction; freeborn; noble; as, ingenuous blood of birth.

Noble; generous; magnanimous; honorable; upright; high-minded; as, an ingenuous ardor or zeal.

Ingenious.

Free from reserve, disguise, equivocation, or dissimulation; open; frank; as, an ingenuous man; an ingenuous declaration, confession, etc.

lacking in sophistication or worldliness; "a child's innocent stare"; "his ingenuous explanation that he would not have burned the church if he had not thought the bishop was in it"

characterized by an inability to mask your feelings; not devious; "an ingenuous admission of responsibility"