rock-ribbed

Adjective rock-ribbed has 2 senses

• rock-ribbed(s = adj.all) rockbound - abounding in or bordered by rocky cliffs or scarps; "the rock-ribbed coast of Maine"
• rock-ribbed(s = adj.all) die-hard - tradition-bound and obstinately opinionated; "an inflexible (or die-hard) conservative"; "rock-ribbed republican"