Which made him doubly dangerous; a pathological liar of the worst kind.

I fell ill of hill fever-to them it is doubly dangerous.

It was simply important to keep Elway in the pocket because when he gets out, he's doubly dangerous.

Unless, of course, he's been exiled, which makes him doubly dangerous.

It was rough going and in the dusk perhaps doubly dangerous.

"This is a distraction which is doubly dangerous because of the world situation."

The captain had outsmarted himself and was trapped, which made him doubly dangerous.

It would be hard enough for just the two of them, but doubly dangerous if they were forced to take him in as well.

He was vulnerable, but that only made him doubly dangerous.

The thin margins available even in the best of times, however, make such losses doubly dangerous and have now become a serious concern.