It was a formidable barrier because of its powerful lock.

In all these new products, price remains a formidable barrier.

To begin with, these forces have created the most formidable barrier to animal movement on earth.

Once the range had been a formidable barrier to trade.

Girls face formidable barriers long before they start their careers.

Here he found a more formidable barrier; an entrance to the building itself.

He himself formed one of the most formidable barriers against outside attack.

Those boundaries made even the most formidable barriers easy to pass.

Those at greatest risk from a higher minimum would be young, poor workers, who already face formidable barriers to getting and keeping jobs.

But high transaction costs are a formidable barrier to financial institutions in developed countries.