He saw, I suppose, that I could not help smiling at the simplicity of this reply; and added, with a smile upon his own ingenuous face: ’Not, of course, but that my Sophy — pretty name, Copperfield, I always think?’
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She plays a wide-eyed, ingenuous schoolgirl forced to grow up too quickly.
The face of the old man was stern, hard-featured, and forbidding; that of the young one, open, handsome, and ingenuous.
Dickens, Charles -- The Life and Adventures of Nicholas Nickleby