I love Willoughby, sincerely love him; and suspicion of his integrity cannot be more painful to yourself than to me.
Could he ever be tolerably happy with Lucy Steele; could he, were his affection for herself out of the question, with his integrity, his delicacy, and well-informed mind, be satisfied with a wife like her—illiterate, artful, and selfish?
Elinor gloried in his integrity; and Marianne forgave all his offences in compassion for his punishment.
Elinor saw, and pitied her for, the neglect of abilities which education might have rendered so respectable; but she saw, with less tenderness of feeling, the thorough want of delicacy, of rectitude, and integrity of mind, which her attentions, her assiduities, her flatteries at the Park betrayed; and she could have no lasting satisfaction in the company of a person who joined insincerity with ignorance; whose want of instruction prevented their meeting in conversation on terms of…
…that Fanny was yet uninformed of her sister’s being there, quitted the room in quest of her; and Elinor was left to improve her acquaintance with Robert, who, by the gay unconcern, the happy self-complacency of his manner while enjoying so unfair a division of his mother’s love and liberality, to the prejudice of his banished brother, earned only by his own dissipated course of life, and that brother’s integrity, was confirming her most unfavourable opinion of his head and heart.
There are no more uses of "integrity" in the book.