The Collaborative International Dictionary of English v.0.48:

Ironbound \I"ron*bound`\, a.
   1. Bound as with iron; rugged; as, an ironbound coast.
      [1913 Webster]

   2. Rigid; unyielding; as, ironbound traditions.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "ironbound":
   asperous, bound, corrugated, cragged, craggy, crinkled, crumpled,
   dour, fettered, firm, fundamentalist, gravelly, hampered,
   handcuffed, hard, harsh, hidebound, impliable, in bonds, in chains,
   in irons, inexorable, inflexible, iron, ironclad, ironhanded,
   jagged, jaggy, manacled, muscle-bound, obdurate, obstinate,
   orthodox, procrustean, purist, puristic, puritan, puritanic,
   ragged, relentless, rigid, rigorist, rigoristic, rigorous,
   rockbound, rocky, rugged, rugose, rugous, saw-toothed, sawtooth,
   scabrous, scragged, scraggly, scraggy, serrate, serrated, shackled,
   snagged, snaggled, snaggy, stiff, stony, straightlaced,
   straitlaced, strapped, stubborn, tethered, tied, tied down,
   tied up, trammeled, unbending, uncompromising, uneven, unrelenting,
   unsmooth, unyielding, wrinkled