Nervous uncertainty of feeling; tremulous alarm, fear; quivering movement.
Immediately after dinner Kitty came in. She knew Anna Arkadyevna, but only very slightly, and she came now to her sister’s with some trepidation, at the prospect of meeting this fashionable Petersburg lady, whom every one spoke so highly of. But she made a favourable impression on Anna Arkadyevna—she saw that at once. Anna was unmistakably admiring her loveliness and her youth: before Kitty knew where she was she found herself not merely under Anna’s sway, but in love with her, as young girls do fall in love with older and married women.
—Leo Tolstoy Anna Karenin (1877)