ironclad[adjective]Synonyms: inflexible, constant, fixed, immovable, immutable, inalterable, invariable, unalterable, unchangeable, unmodifiable
[TahlilGaran] English Synonym Dictionary ▲
i‧ron‧clad /ˈaɪənˌklæd $ -ərn-/
adjective1. an ironclad agreement, proof, defence etc is so strong and sure that it cannot be changed or argued against:
an ironclad guarantee2. old-fashioned covered with iron:
an ironclad battleship [TahlilGaran] Dictionary of Contemporary English ▲