- Clad in iron; protected or covered with iron, as a vessel
for naval warfare. - Rigorous; severe; exacting; as, an ironclad oath or
pledge.
2 . Ironclad
[ n.]
- A naval vessel having the parts above water covered and
protected by iron or steel usually in large plates closely joined and
made sufficiently thick and strong to resist heavy shot.
Meaning of 'ironclad' (Princeton's WordNet)
1 . ironclad
[ s]
Meaning (1): - inflexibly entrenched and unchangeable