WordNet (r) 3.0 (2006):
rock-ribbed adj 1: abounding in or bordered by rocky cliffs or scarps; "the rock-ribbed coast of Maine" [syn: rock-ribbed, rockbound] 2: tradition-bound and obstinately opinionated; "an inflexible (or die-hard) conservative"; "rock-ribbed republican" [syn: die-hard(a), rock-ribbed]