All 6 Uses

sinister
in
Tamar, by Mal Peet
(Edited)

Sinister, or something?
*

sinister = evil, harmful, or frightening
"Hey," he said admiringly, "that is sinister!"
The upward light from the lantern he carried turned Dart's face into a yellow-and-black mask that was both comical and sinister.
The very word itself seemed sinister, a word from black magic.
Also, it seemed to me that there was something, well, sinister about the way the box was tied shut with two thicknesses of string and sealed with strong tape.
Sinister.

Definitions:

(1) (sinister)
evil or harmful; or making an evil or frightening impression
(2) (meaning too rare to warrant focus)
Much more rarely and only in very old usage, sinister can refer to the left side of something.