ironclad
1. [ adjective ] inflexibly entrenched and unchangeable
Synonyms: brassbound
Examples:

"brassbound traditions" "brassbound party loyalists" "an ironclad rule"

Related terms: inflexible
2. [ adjective ] without flaws or loopholes
Synonyms: unshakable watertight bulletproof unassailable
Examples:

"an ironclad contract" "a watertight alibi" "a bulletproof argument"

Related terms: incontestable
Similar spelling:   iron_collar
  ironical
  iron_cage
  ironic
  irenic
  ironically