eisern

/ˈaɪ̯zɐn/

adjective B1

der (masc.) die (fem.) das (neut.)

Underline = a spelling pattern that usually signals that gender.

Meaning

iron, made of iron; ironclad, unyielding (figurative)
- Er hielt sich mit eiserner Disziplin an den Plan.
  
  He stuck to the plan with iron discipline.

Similar in other languages

English

Close, figuratively — ironclad, unyielding relates to robust.

1 What does eisern mean?

2 Which fingerprint chart matches eisern?