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Adjective: rock-ribbed  'rók,ribd
Usage: N. Amer
  1. Abounding in or bordered by rocky cliffs or scarps
    "the rock-ribbed coast of Maine";
    - rockbound
     
  2. Tradition-bound and obstinately opinionated
    "rock-ribbed republican";
    - die-hard

See also: inflexible, rough, unsmooth