The blank side of his face was much wrinkled and puckered up, which gave him a very sinister appearance, especially when he smiled, at which times his expression bordered closely on the villainous.
A spare, dark, withered man, of about his own age, with a stooping body, and a very sinister face rendered more ill-favoured by hollow and hungry cheeks, deeply sunburnt, and thick black eyebrows, blacker in contrast with the perfect whiteness of his hair; roughly clothed in shabby garments, of a strange and uncouth make; and having about him an indefinable manner of depression and degradation—this, for a moment, was all he saw.
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.