She did notice that the young of this species were kept behind a formidable wall of their elders.

The fortifications consisted of a formidable wall with four main gates, three opening to land and one to the sea.

Easy first few miles before the start of the ascent with the formidable wall of Siabod in your right.

In both films it's not only age barriers that have to be crossed, but also (for Europe at least) the more formidable walls of class.

But the crusade against excessive fees could run up against a formidable wall.

The boys eagerly scanned the formidable wall of rock.

The improvements, including the formidable defensive wall, were completed in 1847.

And then there was nothing more ahead of Will but bare grey rock: a formidable blank wall, ending the cleft.

About all they were able to see of the great house itself were the formidable outer walls of gray stone, several stories high.

The palace stood upon a knoll above the town, yet within the formidable walls.