Rhett watched the train until it was out of sight and on his face there was a look of speculative bitterness that was not pleasant.
In the look of farewell on his face there was no sorrow, no pain, only a speculative wonder at himself, only a poignant stirring of emotions dead since boyhood, as he said again: "A very great lady."
He dropped her chin and, turning, walked back to his chair and sprawled tiredly again, his chin on his breast, his eyes looking up at her from under black brows in an impersonal speculative way.
But Scarlett never lost the old feeling that he was watching her covertly, knew that if she turned her head suddenly she would surprise in his eyes that speculative, waiting look, that look of almost terrible patience that she did not understand.
There are no more uses of "speculative" in the book.
Show samples from other sources
I’m too old to invest in speculative business enterprises.
My speculative sister, she of the rocket-science brain and the rodeo spirit, dropped out of college and moved to Manhattan in the late ’90s.