How to use "formidable" in a sentence

He was considerably more formidable than his associate: tall, rough-edged, with large, big-knuckled, leathery hands - like something that had escaped from a recombinant DNA lab experimenting in the crossbreeding of human beings with bears

He appeared formidable, even with his beer belly, which bulged over the waistband of his trousers.

Entering the formidable mountains, they had become aware of how soon darkness would settle over the sheltered valleys and ravines, and they had discussed the wisdom of proceeding