- Apparent incongruity - Incongruity - Incongruity resembling ferrous metal? - Perverse humour - Sarcasm - Satirical use of words - Speech with double meaning
- Covered in ferrous metal - Dressed in armour that is watertight? - Inflexible, rigid - Unbreakable (agreement) - Watertight - Clad in iron; protected or covered with iron, as a vessel
for naval warfare. - Rigorous; severe; exacting; as, an ironclad oath or
pledge.