'sinister purpose' is a grammatically correct phrase that can be used in written English.
You can use it to describe someone's bad or evil intentions. For example, "The mob boss had a sinister purpose in mind when he sent his men out to collect debts from the locals."
"We weren't attempting to rescue this apparatus from its sinister purpose," he said.
Several sources implied that this caretaking had a sinister purpose: the K.L.A. was harvesting the prisoners' organs and selling them on the black market.
"The wave of enthusiasm for a solution that would preserve LICH may have blinded many to a more sinister purpose to seize its assets and dismantle the hospital".
If A Kiss Before Dying highlighted Levin's ability to put construction skills to a sinister purpose, this play showed a relish of farce.
Wikipedia and others, including the New York Times, have suggested that Hell.com is the front-end for a secretive global group of unknown but clearly sinister purpose.
But other passengers on American Trans Air Flight 204 from Chicago Tuesday night feared that the family had a more sinister purpose.
"It's part of a much bigger picture of social networking sites on the Internet harvesting private data, whether for marketing or for more sinister purposes," he said.
According to a swirl of rumour filtering out of Libya, the thousands of miles of underground tunnelling and storage dumps are more elaborate than would be needed simply to carry water, and might be intended for more sinister purposes.
It starred John Cassavetes as a shadowy figure who hopes to use the psychic gifts of two high schoolers (Irving and Andrew Stevens) for his own sinister purposes; Kirk Douglas appeared as the father of one of the teenagers.
The survivors, it is maintained, are the real lords of the universe today: far more powerful than mere nation states.Like Mr Galbraith's oligarchs, these corporate barons plan the world economy for their own sinister purposes.
There can be little doubt that his friendliness, boyish looks and unerring punctuality with the delivery of rent checks (obviously acquired in some cunning and bloody way) are designed to put us at ease and conceal his sinister purposes.
