Akademik

ironclad
I adjective covered, defended, difficult to alter, difficult to break, difficult to change, exacting, firm, immutable, impossible to alter, impossible to break, impossible to change, inexorable, inflexible, ironbound, irreversible, irrevocable, relentless, rigid, rigorous, strict, stringent, unalterable, unbending, unbreakable, unchangeable, unchanging, uncompromising, unmalleable, unpliant, unrelenting, unshakeable, unyielding II index severe

Burton's Legal Thesaurus. . 2006