1.  A more sinister reason is that the horse is in fact running away from pain.

2.  But there may be a more sinister reason.

3.  Now, the leaders suspect that the most sinister reasons lurk behind government decisions that have gone against them.

4.  There was no sinister reason Golay departed Seton Hall.

5.  Your beloved school then tried to smear this man by suggesting more sinister reasons without deigning to identify them.

6.  Others see more sinister reasons.

7.  She dismissed speculation that the Chinese might have some sinister reason to group all their people in one place.