Observe how ingenuously he underlines certain words, and how crudely he glosses over his hidden thoughts.
Yet his smile, in spite of its sweetness, was a little thin, if I may so call it, and showed his teeth too evenly; his gaze though decidedly good-humoured and ingenuous, was a trifle too inquisitive and intent to be altogether agreeable.
"No, I’m not married!" replied the prince, smiling at the ingenuousness of this little feeler.
This is an excess of ingenuousness or of malice—you ought to know better than anyone which word best fits the case.
"Why, no, it is hardly the same," remarked Gavrila Ardalionovitch, with an air of ingenuous surprise.
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Show samples from other sources
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