Synonyms of the word

ironclad

• adj. Covered with iron, steel, or some metal, armor-plated.
• adj. (figuratively) Solid or certain; not able to be disputed or questioned; irrefutable.
• adj. (figuratively) Rigorous; severe; exacting.
• n. A metal-plated ship, vessel, or vehicle.
• n. (military) An armor-plated warship.

brassbound

• adj. Bound with brass.

inflexible

• adj. Not flexible; not capable of bending or being bent; stiff; rigid; firm; unyielding.
• adj. Not willing to change, e.g. one's opinion or habits; obstinate; stubborn; resolute; determined.

sheathed

• v. simple past tense and past participle of sheath.

warship

• n. Any ship built or armed for naval combat.