His knowledge and her ignorance of the subject, his rapidity of expression, and her diffidence of herself put that out of her power; she could strike out nothing new in commendation, but she readily echoed whatever he chose to assert, and it was finally settled between them without any difficulty that his equipage was altogether the most complete of its kind in England, his carriage the neatest, his horse the best goer, and himself the best coachman.
Had she been older or vainer, such attacks might have done little; but, where youth and diffidence are united, it requires uncommon steadiness of reason to resist the attraction of being called the most charming girl in the world, and of being so very early engaged as a partner; and the consequence was that, when the two Morlands, after sitting an hour with the Thorpes, set off to walk together to Mr. Allen’s, and James, as the door was closed on them, said, "Well, Catherine, how do…
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She is diffident around adults, but dominant with her peer group.
At first, he could give no encouragement; with unfeigned diffidence, he expressed his conviction that he was not adequate to the performance of so great a task;
Frederick Douglass -- The Narrative of the Life of Frederick Douglass