No, don't bother to tell me again that they did it strictly for their own sinister purposes.

To sort out parts of for a purpose, especially a sinister purpose.

The station itself gave no clue as to its sinister new purpose.

They have served a more sinister purpose in their time.

But in a moment we will see its sinister purpose.

Perhaps they want to lure as many people as possible for some sinister purpose.

Could someone have lured her out in the dead of night for sinister purposes?

It was evident they had some sinister purpose in mind.

It looked like a child's drawing, but Harry suspected a sinister purpose behind that card.

There is a force within the building that seems determined to use Danny for an unknown, possibly sinister purpose.