sinister
adj
1 suggesting evil, or that sth bad may happen 邪恶的; 险恶的; 不吉祥的; 凶兆的
a sinister motive, action, place 邪恶的动机、 险恶的行动、 不祥之处.
2 suggesting an evil nature 凶恶的; 阴险的
a sinister face 凶恶的脸
sinister looks 阴险的神情.
On turning eagerly to the text, one learns that the lady was a typist who found the sound of office typewriters worried her more and more until eventually she had to go into a mental hospital.