ironclad

Noun
  1. A wooden warship of the 19th century that is plated with iron or steel armor (synset 103590720)
Adjective
  1. Sheathed in iron plates for protection (synset 302162776)
  2. Inflexibly entrenched and unchangeable (synset 301029347)
    "brassbound traditions"; "brassbound party loyalists"; "an ironclad rule"

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