The millers belonging to the mills, when they saw the boat coming down the river, and on the point of being sucked in by the draught of the wheels, ran out in haste, several of them, with long poles to stop it, and being all mealy, with faces and garments covered with flour, they presented a sinister appearance.
There are no more uses of "sinister" in the book.
Show samples from other sources
They created a sinister plan to recruit terrorists.
In the movie, there was a sinister plot to kill people and harvest their organs.