Twenty years earlier the means of resistance must have been far fewer, and the enemy in command of almost all the lines of access between the beleaguered villages; and, considering these things, I felt the sinister force of Harmon’s phrase: "Most of the smart ones get away."
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.