Wiktionary
a. 1 having rocky cliffs or outcroppings 2 obstinately firm and unyielding in one's opinions
WordNet
adj. abounding in or bordered by rocky cliffs or scarps; "the rock-ribbed coast of Maine" [syn: rockbound]
tradition-bound and obstinately opinionated; "an inflexible (or die-hard) conservative"; "rock-ribbed republican" [syn: die-hard(a)]
Usage examples of "rock-ribbed".
McCrea were spinning away up the west shore under the lofty, rock-ribbed scarp of Crow Nest and Storm King, to ferry over to Fishkill from Newburg, and there take the Pacific express, making its first stop out of New York City.
In dust of the wayside growing, On rock-ribbed upland blowing, By meadow brooklets glancing, On barren fields a-dancing, Till the world forgets to burrow and grope, And rises aloft on the wings of hope.
When I remind you that we have one motor car for every five and seven-eighths persons in the city, then I give a rock-ribbed practical indication of the kind of progress and braininess which is synonymous with the name Zenith!