Lacking interesting, stimulating, or distinctive qualities, as in an insipid, boring speaker; without a sufficient taste to be pleasing, as in an insipid meal.
Kitty, to her very material advantage, spent the chief of her time with her two elder sisters. In society so superior to what she had generally known, her improvement was great. She was not of so ungovernable a temper as Lydia; and, removed from the influence of Lydia’s example, she became, by proper attention and management, less irritable, less ignorant, and less insipid. From the further disadvantage of Lydia’s society she was of course carefully kept; and though Mrs. Wickham frequently invited her to come and stay with her, with the promise of balls and young men, her father would never consent to her going.
—Jane Austen Pride and Prejudice (1813)