A vague doubt assailed him as to whether the Trodon had been killed or not.

And yet she felt no disapproval of Connie, but only a vague doubt.

She had wiped away any vague doubt that might have been springing up in my mind.

There was a new vague doubt stirring in his brain.

What did my vague doubts mean compared to all that?

Apparently there was nothing to be made, only a vague doubt assailed him.

Her vague doubt of him had been created by his attitude toward her.

Serena would be home by now, although at the back of his mind was the vague doubt that she wasn't.

Her doubts, vague but persistent, began to melt away, the future looked warm and welcoming.

Merlin was beginning to have vague doubts as to whether he had been effectively fooled.