That said, I doubt strongly that they have any interest in it.

And doubted strongly that a prayer, if heard, was likely to change God's mind about anything at all, or alter the course of events.

I strongly doubt that anyone ever mentioned any of this to him.

Jack doubted that very strongly, but it was beside the point.

And I strongly doubt if the door at the head is bolted.

I strongly doubt that he had ever heard a humanoid voice before.

I strongly doubt that you'd guess who most of them are.

It could have been a coincidence, but he strongly doubted that, which meant they'd most likely spent the night together.

He strongly doubted it could have been anything but deliberate.

I strongly doubt Lod$ys will manage to actually kill any platform.