- having ribs or ridges of rock: the rock-ribbed coast of Maine.
- unyielding; confirmed and uncompromising: a rock-ribbed conservative.
Origin of rock-ribbed
First recorded in 1770–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for rock-ribbed
After all, Kansas is as rock-ribbed a Republican state as they come.Kansas Republicans Pat Roberts and Sam Brownback Lifted by Rising Tide
November 5, 2014
I am shocked at how many New Yorkers I had thought to be rock-ribbed Democrats are attending Romney fundraisers.The Benefits of Business Experience
October 1, 2012
The road-bed is literally 'rock-ribbed,' if not 'eternal as the sun.'Scenic Mount Lowe and Its Wonderful Railway
George Wharton James
But Taygetos, rock-ribbed and ancient as the sun, remains as it was.Vacation days in Greece
Rufus B. Richardson
The strata of society are as immovable as the strata of the rock-ribbed hills.
From end to end its rock-ribbed hills are filled with tombs.
In other words, the spine is a bodily structure as old as the rock-ribbed hills.Vitality Supreme