WordNet (r) 3.0 (2006):

rockbound
    adj 1: abounding in or bordered by rocky cliffs or scarps; "the
           rock-ribbed coast of Maine" [syn: rock-ribbed,
           rockbound]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "rockbound":
   corrugated, cragged, craggy, crinkled, crumpled, dour, firm,
   fundamentalist, gravelly, hard, harsh, hidebound, impliable,
   inexorable, inflexible, iron, ironbound, ironclad, ironhanded,
   jagged, jaggy, muscle-bound, obdurate, obstinate, orthodox,
   procrustean, purist, puristic, puritan, puritanic, ragged,
   relentless, rigid, rigorist, rigoristic, rigorous, rocky, rugged,
   rugose, rugous, saw-toothed, sawtooth, scragged, scraggly, scraggy,
   serrate, serrated, snagged, snaggled, snaggy, stiff, stony,
   straightlaced, straitlaced, stubborn, unbending, uncompromising,
   unrelenting, unyielding, wrinkled