From Yunnan in China, from the clattering bright bazaars, crept something invisible in the sun and vigilant by dark, creeping, sinister, ceaseless; creeping across the Himalayas, down through walled market-places, across a desert, along hot yellow rivers, into an American missionary compound—creeping, silent, sure; and here and there on its way a man was black and stilled with plague.
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.