Get the FREE one-click dictionary software for Windows
or the iPhone/iPad and Android apps
Adjective: rock-ribbed  'rók,ribd
Usage: N. Amer
  1. Tradition-bound and obstinately opinionated
    "rock-ribbed republican";
    - die-hard
     
  2. Abounding in or bordered by rocky cliffs or scarps
    "the rock-ribbed coast of Maine";
    - rockbound

See also: inflexible, rough, unsmooth