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

• arranged
• arrangement
• arranger
• arranging
• arrant
• arras
• array
• arrayed
• arrear
• arrearage
• arrears
• arrest
• arrest warrant
• arrested development
• arrestee
• arrester
• arrester hook
• arresting
• arrestment
• Arrhenatherum
• Arrhenatherum elatius
• Arrhenius
• Arrhenius theory of dissociation
• arrhythmia
• arrhythmic