1. Very rough or arduous. The terrain here is plenty rugged—I'm exhausted from hiking it.
2. Very powerful, strong, and, of objects, durable. That truck is plenty rugged, so you'll have no trouble on this rough terrain. Tricia likes big guys who are tall, swarthy, and plenty rugged.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.