Webster's Revised Unabridged Dictionary · 1913

Ingenuous

Ingenuous , adjective

[Latin ingenuus inborn, innate, freeborn, noble, frank; pref. in- in + the root of gignere to beget. See Genius, and compare Ingenious.]

1.
Of honorable extraction; freeborn; noble; as, ingenuous blood of birth.
2.
Noble; generous; magnanimous; honorable; upright; high-minded; as, an ingenuous ardor or zeal.
If an ingenuous detestation of falsehood be but carefully and early instilled, that is the true and genuine method to obviate dishonesty. — Locke
3.
Free from reserve, disguise, equivocation, or dissimulation; open; frank; as, an ingenuous man; an ingenuous declaration, confession, etc.
Sensible in myself... what a burden it is for me, who would be ingenuous, to be loaded with courtesies which he hath not the least hope to requite or deserve. — Fuller
4.
Ingenious. [Obsolete] — Shakespeare

(Formerly) printers did not discriminate between... ingenuous and ingenious, and these words were used or rather printed interchangeably almost to the beginning of the eighteenth century.