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.
William C. Burton.
2006