From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
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
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