askance - adverb
“Do you suppose he can possibly recover?” said Levin, watching a slender tress at the back of her round little head that was continually hidden when she passed the comb through the front.
”I asked the doctor; he said he couldn’t live more than three days. But can they be sure? I’m very glad, any way, that I persuaded him,” she said, looking askance at her husband through her hair. “Anything is possible,” she added with that peculiar, rather sly expression that was always in her face when she spoke of religion.
—Leo Tolstoy Anna Karenin (1877)