'Rugged' in the Bible

“Let every valley be lifted up,And every mountain and hill be made low;And let the rough ground become a plain,And the rugged terrain a broad valley;

“I will lead the blind by a way they do not know,In paths they do not know I will guide them.I will make darkness into light before themAnd rugged places into plains.These are the things I will do,And I will not leave them undone.”